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Addition of the Local Volume sample of galaxies from the FAST HI survey Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-25 Igor D. Karachentsev, Valentina E. Karachentseva, Serafim S. Kaisin, Chuan-Peng Zhang
We report the discovery of 20 new dwarf galaxies in the Local Volume identified as optical counterparts to the Five-hundred-meter Aperture Spherical radio Telescope (FAST) All Sky HI Survey (FASHI) sources. The galaxies have a median stellar mass of 7.8 × 106 M⊙ and a median HI mass of 1.0 × 107 M⊙. Most of them are field galaxies, while three are probable members of the M 101 and M 106 groups. We
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Cosmography with supernova Refsdal through time-delay cluster lensing: Independent measurements of the Hubble constant and geometry of the Universe Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-24 C. Grillo, L. Pagano, P. Rosati, S H. Suyu
We present new measurements of the values of the Hubble constant, matter density, dark energy density, and dark energy density equation-of-state (EoS) parameters. These results have been obtained from a full strong-lensing analysis of the observed positions of 89 multiple images and 4 measured time delays of the supernova (SN) Refsdal in the Hubble Frontier Fields galaxy cluster MACS J1149.5+2223.
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The jet of BP Tau Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-25 A. V. Dodin, S. A. Potanin, M. A. Burlak, D. V. Cheryasov, N. P. Ikonnikova, S. A. Lamzin, B. S. Safonov, N. I. Shatskii, A. M. Tatarnikov
Context. A strong global magnetic field of young low-mass stars and a high accretion rate are the necessary conditions for the formation of collimated outflows (jets) from these objects. But it is still unclear whether these conditions are also sufficient.Aims. We aim to check whether BP Tau, an actively accreting young star with a strong magnetic field, has a jet.Methods. We carried out narrowband
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Imaging spectroscopy of a spectral bump in a type II radio burst⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-24 Peijin Zhang, Diana E. Morosan, Pietro Zucca, Sanna Normo, Bartosz Dabrowski, Andrzej Krankowski, Christian Vocks
Context. Observations of solar, type II radio bursts provide a unique opportunity to analyze the nonthermal electrons accelerated by coronal shocks and diagnose the plasma density distribution in the corona. However, there are very few high-frequency resolution interferometric observations of type II radio bursts that are capable of tracking these electrons.Aims. Recently, more spatially resolved high-resolution
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The Galactic bulge exploration Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-19 Z. Prudil, A. Kunder, I. Dékány, A. J. Koch-Hansen
We present a new set of period–absolute magnitude–metallicity (PMZ) relations for single-mode RR Lyrae stars calibrated for the optical GBP, V, G, GRP, near-infrared I, J, H, and Ks passbands. We compiled a large dataset (over 100 objects) of fundamental and first-overtone RR Lyrae pulsators consisting of mean intensity magnitudes, reddenings, pulsation properties, iron abundances, and parallaxes measured
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The neutrino background from non-jetted active galactic nuclei Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-19 P. Padovani, R. Gilli, E. Resconi, C. Bellenghi, F. Henningsen
Aims. We calculate the contribution to the neutrino background from the non-jetted active galactic nuclei (AGN) population following the recent IceCube association of TeV neutrinos with NGC 1068.Methods. We exploited our robust knowledge of the AGN X-ray luminosity function and evolution and converted it to the neutrino band by using NGC 1068 as a benchmark, together with a theoretically motivated
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Age of (152830) Dinkinesh I Selam constrained by secular tidal-BYORP theory Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-19 C. C. Merrill, A. R. Kubas, A. J. Meyer, S. D. Raducan
We constrained the age of the main belt binary asteroid system, (152830) Dinkinesh, through secular dynamics and assuming the secondary, Selam, is at equilibrium. We reproduced Selam’s current semi-major axis and rotation period and Dinkinesh’s current rotation period, starting from the initial conditions of the spin-up fission event. The method presented here includes the secular effects of YORP,
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Once in a blue stream Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-17 David Martínez-Delgado, Santi Roca-Fàbrega, Armando Gil de Paz, Denis Erkal, Juan Miró-Carretero, Dmitry Makarov, Karina T. Voggel, Ryan Leaman, Walter Bolchin, Sarah Pearson, Giuseppe Donatiello, Evgenii Rubtsov, Mohammad Akhlaghi, M. Angeles Gomez-Flechoso, Samane Raji, Dustin Lang, Adam Block, Jesus Gallego, Esperanza Carrasco, María Luisa García-Vargas, Jorge Iglesias-Páramo, Sergio Pascual, Nicolas
Aims. In this work we study the striking case of a narrow blue stream with a possible globular cluster-like progenitor around the NGC 7241 galaxy and its foreground dwarf companion. We want to figure out if the stream was generated by tidal interaction with NGC 7241 or if it first interacted with the foreground dwarf companion and later both fell together toward NGC 7241.Methods. We used four sets
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The central black hole in the dwarf spheroidal galaxy Leo I: Not supermassive, at most an intermediate-mass candidate Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-17 R. Pascale, C. Nipoti, F. Calura, A. Della Croce
It has recently been claimed that a surprisingly massive black hole (BH) is present in the core of the dwarf spheroidal galaxy (dSph) Leo I. This finding, based on integral field spectroscopy, challenges the typical expectation that dSphs host intermediate-mass BHs since such a BH would be classified as supermassive. Indeed, the analysis points toward Leo I harboring a BH with a lower mass limit exceeding
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Orbital obliquity of the young planet TOI-5398 b and the evolutionary history of the system⋆⋆⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 G. Mantovan, L. Malavolta, D. Locci, D. Polychroni, D. Turrini, A. Maggio, S. Desidera, R. Spinelli, S. Benatti, G. Piotto, A. F. Lanza, F. Marzari, A. Sozzetti, M. Damasso, D. Nardiello, L. Cabona, M. D’Arpa, G. Guilluy, L. Mancini, G. Micela, V. Nascimbeni, T. Zingales
Multi-planet systems exhibit remarkable architectural diversity. However, short-period giant planets are typically isolated. Compact systems like TOI-5398, with an outer close-orbit giant and an inner small-size planet, are rare among systems containing short-period giants. TOI-5398’s unusual architecture coupled with its young age (650 ± 150 Myr) make it a promising system for measuring the original
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Zooming in on the circumgalactic medium with GIBLE Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 Rahul Ramesh, Dylan Nelson, Drummond Fielding, Marcus Brüggen
We used a cosmological zoom-in simulation of a Milky Way-like galaxy to study and quantify the topology of magnetic field lines around cold gas clouds in the circumgalactic medium (CGM). This simulation is a new addition to Project GIBLE, a suite of cosmological magnetohydrodynamic simulations of galaxy formation with preferential super-Lagrangian refinement in the CGM, reaching an unprecedented CGM
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Cosmic hide and seek: The volumetric rate of X-ray quasi-periodic eruptions Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 R. Arcodia, A. Merloni, J. Buchner, P. Baldini, G. Ponti, A. Rau, Z. Liu, K. Nandra, M. Salvato
Multiwavelength extragalactic nuclear transients, particularly those detectable as multi-messengers, are among the primary drivers for the next-generation observatories. X-ray quasi-periodic eruptions (QPEs) are the most recent and perhaps most peculiar addition to this group. Here, we report a first estimate of the volumetric rate of QPEs based on the first four discoveries with the eROSITA X-ray
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Constraints on supermassive black hole binaries from JWST and NANOGrav Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 Hamsa Padmanabhan, Abraham Loeb
We use the recent statistics of dual active galactic nuclei (AGN) in the James Webb Space Telescope (JWST) data at z ∼ 3.4 to address two aspects of the feedback and evolution scenarios of supermassive black hole binaries. We find that the JWST data provide evidence for the members of a binary BH being ‘lit’ at the same time, rather than independently – a scenario which is consistent with gas-rich
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Spectroscopic observations of progenitor activity 100 days before a Type Ibn supernova⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-16 S. J. Brennan, J. Sollerman, I. Irani, S. Schulze, P. Chen, K. K. Das, K. De, C. Fransson, A. Gal-Yam, A. Gkini, K. R. Hinds, R. Lunnan, D. Perley, Y. J. Qin, R. Stein, J. Wise, L. Yan, E. A. Zimmerman, S. Anand, R. J. Bruch, R. Dekany, A. J. Drake, C. Fremling, B. Healy, V. Karambelkar, M. M. Kasliwal, M. Kong, S. R. Kulkarni, F. J. Masci, R. S. Post, J. Purdum, R. Michael Rich, A. Wold
Obtaining spectroscopic observations of the progenitors of core-collapse supernovae is often unfeasible, due to an inherent lack of knowledge as to what stars experience supernovae and when they will explode. In this Letter we present photometric and spectroscopic observations of the progenitor activity of SN 2023fyq before the He-rich progenitor explodes as a Type Ibn supernova. The progenitor of
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Determining stellar accretion rates from Paα and Brβ emission lines with JWST NIRSpec Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 Ciarán Rogers, Guido de Marchi, Bernhard Brandl
In this Letter, we present the first systematic spectroscopic measurements of the near-infrared (NIR) hydrogen recombination lines Paschen alpha (Paαλ = 1.875 μm) and Brackett beta (Brβλ = 2.626 μm), produced by pre-main-sequence (PMS) stars. Such stars include T Tauri and Herbig AeBe stars, located in the massive Galactic star-forming region NGC 3603. We used measurements obtained from JWST NIRSpec
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A spectacular galactic scale magnetohydrodynamic powered wind in ESO 320-G030 Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 M. D. Gorski, S. Aalto, S. König, C. F. Wethers, C. Yang, S. Muller, K. Onishi, M. Sato, N. Falstad, J. G. Mangum, S. T. Linden, F. Combes, S. Martín, M. Imanishi, K. Wada, L. Barcos-Muñoz, F. Stanley, S. García-Burillo, P. P. van der Werf, A. S. Evans, C. Henkel, S. Viti, N. Harada, T. Díaz-Santos, J. S. Gallagher, E. González-Alfonso
How galaxies regulate nuclear growth through gas accretion by supermassive black holes (SMBHs) is one of the most fundamental questions in galaxy evolution. One potential way to regulate nuclear growth is through a galactic wind that removes gas from the nucleus. It is unclear whether galactic winds are powered by jets, mechanical winds, radiation, or via magnetohydrodynamic (MHD) processes. Compact
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The orbital parameters of the δ Cep inner binary system determined using 2019 HARPS-N spectroscopic data Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 N. Nardetto, V. Hocdé, P. Kervella, A. Gallenne, W. Gieren, D. Graczyk, A. Merand, M. Rainer, J. Storm, G. Pietrzyński, B. Pilecki, E. Poretti, M. Bailleul, G. Bras, A. Afanasiev
Context. An inner companion has recently been discovered orbiting the prototype of classical Cepheids, δ Cep, whose orbital parameters are still not fully constrained.Aims. We collected new precise radial velocity measurements of δ Cep in 2019 using the HARPS-N spectrograph mounted at the Telescopio Nazionale Galileo. Using these radial velocity measurements, we aimed to improve the orbital parameters
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FAUST Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 G. Sabatini, L. Podio, C. Codella, Y. Watanabe, M. De Simone, E. Bianchi, C. Ceccarelli, C. J. Chandler, N. Sakai, B. Svoboda, L. Testi, Y. Aikawa, N. Balucani, M. Bouvier, P. Caselli, E. Caux, L. Chahine, S. Charnley, N. Cuello, F. Dulieu, L. Evans, D. Fedele, S. Feng, F. Fontani, T. Hama, T. Hanawa, E. Herbst, T. Hirota, A. Isella, I. Jímenez-Serra, D. Johnstone, B. Lefloch, R. Le Gal, L. Loinard
Context. The origin of the chemical diversity observed around low-mass protostars probably resides in the earliest history of these systems.Aims. We aim to investigate the impact of protostellar feedback on the chemistry and grain growth in the circumstellar medium of multiple stellar systems.Methods. In the context of the ALMA Large Program FAUST, we present high-resolution (50 au) observations of
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The dispersion of the Ep, i–Liso correlation of long gamma-ray bursts is partially due to assembling different sources Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 M. Maistrello, R. Maccary, C. Guidorzi, L. Amati
Context. Long gamma-ray burst (GRB) prompt emission shows a correlation between the intrinsic peak energy, Ep, i, of the time-average νFν spectrum and the isotropic-equivalent peak gamma-ray luminosity, Lp, iso, as well as the total released energy, Eiso. The same correlation is found within individual bursts, when time-resolved Ep, i and Liso are considered. These correlations are characterised by
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New constraints on Triton’s atmosphere from the 6 October 2022 stellar occultation Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-10 Ye Yuan, Chen Zhang, Fan Li, Jian Chen, Yanning Fu, Chunhai Bai, Xing Gao, Yong Wang, Tuhong Zhong, Yixing Gao, Liang Wang, Donghua Chen, Yixing Zhang, Yang Zhang, Wenpeng Xie, Shupi Zhang, Ding Liu, Jun Cao, Xiangdong Yin, Xiaojun Mo, Jing Liu, Xinru Han, Tong Liu, Yuqiang Chen, Zhendong Gao, Xiang Zeng, Guihua Niu, Xiansheng Zheng, Yuchen Lin, Peiyu Ye, Weitang Liang, Chengcheng Zhu, Zhiqiang Hu
The atmosphere of Triton was probed directly by observing a ground-based stellar occultation on 6 October 2022. This rare event yielded 23 positive light curves collected from 13 separate observation stations contributing to our campaign. The significance of this event lies in its potential to directly validate the modest pressure fluctuation on Triton, a phenomenon not definitively verified by previous
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Polarimetric differential imaging with VLT/NACO Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-09 S. de Regt, C. Ginski, M. A. Kenworthy, C. Caceres, A. Garufi, T. M. Gledhill, A. S. Hales, N. Huelamo, Á. Kóspál, M. A. Millar-Blanchaer, S. Pérez, M. R. Schreiber
Context. The observed diversity of exoplanets can possibly be traced back to the planet formation processes. Planet-disk interactions induce sub-structures in the circumstellar disk that can be revealed via scattered light observations. However, a high-contrast imaging technique such as polarimetric differential imaging (PDI) must first be applied to suppress the stellar diffraction halo.Aims. In this
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A too-many-dwarf-galaxy-satellites problem in the M 83 group Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 Oliver Müller, Marcel S. Pawlowski, Yves Revaz, Aku Venhola, Marina Rejkuba, Michael Hilker, Katharina Lutz
Dwarf galaxies in groups of galaxies provide excellent test cases for models of structure formation. This led to a so-called small-scale crisis, including the famous missing-satellites and too-big-to-fail problems. It was suggested that these two problems can be resolved by introducing baryonic physics to cosmological simulations. We tested the nearby grand spiral M 83 – a Milky Way sibling – to determine
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Tracking the motion of a shock along a channel in the low solar corona Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 J. Rigney, P. T. Gallagher, G. Ramsay, J. G. Doyle, D. M. Long, O. Stepanyuk, K. Kozarev
Context. Shock waves are excited by coronal mass ejections (CMEs) and large-scale extreme-ultraviolet (EUV) wave fronts and can result in low-frequency radio emission under certain coronal conditions.Aims. In this work, we investigate a moving source of low-frequency radio emission as a CME and an associated EUV wave front move along a channel of a lower density, magnetic field, and Alfvén speed in
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Differential optical transfer function (dOTF) broad-spectrum wavefront sensing using integral field unit spectroscopy Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 P. Martinez
Context. Detecting and characterizing Earth-like exoplanets is a critical scientific goal for the next generation of telescopes. However, current direct imaging instruments are hindered by evolving noncommon path aberrations (NCPAs), which lead to persistent speckles in the images. The differential optical transfer function (dOTF) is an image-based, noniterative, and model-independent wavefront sensor
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High speed stars Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-08 E. Caffau, P. Bonifacio, L. Monaco, L. Sbordone, M. Spite, P. François, P. Panuzzo, P. Sartoretti, L. Chemin, F. Thévenin, A. Mucciarelli
Context. The Gaia satellite has provided the community with three releases containing astrometrical and photometric data as well as by products, such as stellar parameters and variability indicators.Aims. By selecting in the Gaia database, one can select stars with the requested characteristics, such as high speed. At present any selection is based on available Gaia releases including a subset of the
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Advancements in the 3D shape reconstruction of Phobos: An analysis of shape models and future exploration directions★ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-05 Min Chen, Jianguo Yan, Xianfeng Huang, Zheng Zuo, Konrad Willner, Hanyu Xiang, Jean-Pierre Barriot
Aims. Our research focuses on developing a high-precision and relatively high-resolution shape model of Phobos.Methods. We employed advanced photogrammetric techniques combined with novel computer vision methods to reconstruct the 3D shape of Phobos from nearly 900 Mars Express/SRC and Viking Orbiter images. This research also involved a comparison of the newly developed shape model with previous models
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Asymmetry in the atmosphere of the ultra-hot Jupiter WASP-76 b★★★ Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-05 O. D. S. Demangeon, P. E. Cubillos, V. Singh, T. G. Wilson, L. Carone, A. Bekkelien, A. Deline, D. Ehrenreich, P. F. L. Maxted, B.-O. Demory, T. Zingales, M. Lendl, A. Bonfanti, S. G. Sousa, A. Brandeker, Y. Alibert, R. Alonso, J. Asquier, T. Bárczy, D. Barrado Navascues, S. C. C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, N. Billot, F. Biondi, L. Borsato, Ch. Broeg, M. Buder, A. Collier Cameron
Context. WASP-76 b has been a recurrent subject of study since the detection of a signature in high-resolution transit spectroscopy data indicating an asymmetry between the two limbs of the planet. The existence of this asymmetric signature has been confirmed by multiple studies, but its physical origin is still under debate. In addition, it contrasts with the absence of asymmetry reported in the infrared
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Tidal frequency dependence of the Saturnian k2 Love number Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-05 V. Lainey, J. W. Dewberry, J. Fuller, N. Cooper, N. Rambaux, Q. Zhang
Context. Love numbers describe the fluid and elastic response of a body to the tidal force of another massive object. By quantifying these numbers, we can more accurately model the interiors of the celestial objects concerned.Aims. We determine Saturn’s degree-2 Love number, k2, at four different tidal forcing frequencies.Methods. To do this, we used astrometric data from the Cassini spacecraft and
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One size fits all: Insights into extrinsic thermal absorption based on the similarity of supernova remnant radio-continuum spectra Astron. Astrophys. (IF 6.5) Pub Date : 2024-04-04 Mario G. Abadi, Gabriela Castelletti, Leonardo Supan, Namir E. Kassim, Joseph W. Lazio
Typically, integrated radio frequency continuum spectra of supernova remnants (SNRs) exhibit a power-law form due to their synchrotron emission. In numerous cases, these spectra show an exponential turnover, which has long been assumed to be due to thermal free-free absorption in the interstellar medium. We used a compilation of Galactic radio continuum SNR spectra, with and without turnovers, to constrain
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The cold molecular gas in z ≳ 6 quasar host galaxies Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-29 Melanie Kaasinen, Bram Venemans, Kevin C. Harrington, Leindert A. Boogaard, Romain A. Meyer, Eduardo Bañados, Roberto Decarli, Fabian Walter, Marcel Neeleman, Gabriela Calistro Rivera, Elisabete da Cunha
Context. Probing the molecular gas reservoirs of z ≳ 6 quasar (QSO) host galaxies is fundamental to understanding the coevolution of star formation and black hole growth in these extreme systems. Yet, there is still an inhomogeneous coverage of molecular gas tracers for z ≳ 6 QSO hosts.Aims. To measure the average excitation and mass of the molecular gas reservoirs in the brightest z > 6.5 QSO hosts
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INTEGRAL view of GRB 221009A Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-29 Volodymyr Savchenko, Pietro Ubertini, Angela Bazzano, James Craig Rodi, Elisabeth Jourdain, Jean-Pierre Roques, Antonio Martin-Carrillo, Lorraine Hanlon, Sandro Mereghetti, Andrea Tiengo, Philippe Laurent, Diego Gotz, Carlo Ferrigno, Erik Kuulkers
The gamma-ray burst GRB 221009A is among the most luminous of its kind and its proximity to Earth has made it an exceptionally rare observational event. The International Gamma-ray Astrophysics Laboratory (INTEGRAL) was in an optimal aspect position to use its all-sky instruments for recording the prompt emission and early gamma-ray afterglow in unprecedented detail. Following the initial detection
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The nature of the X-ray filaments around bow shock pulsar wind nebulae Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-28 Barbara Olmi, Elena Amato, Rino Bandiera, Pasquale Blasi
Context. We propose that the X-ray filaments emerging from selected bow shock pulsar wind nebulae are due to a charge-separated outflow of electrons and/or positrons escaping the nebula and propagating along the local Galactic magnetic field.Aims. The X-ray brightness, length, and thickness of filaments are all accounted for if a nonresonant streaming instability is excited.Methods. This is possible
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Spectroscopic searches for evolutionary orbital period changes in WR+OB binaries: The case of WR 127 (Hen 3-1772) Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-22 I. A. Shaposhnikov, A. M. Cherepashchuk, A. V. Dodin, K. A. Postnov
Aims. We aim to determine the secular evolution of the orbital period of the short-period binary system WR 127 (WN3b+O9.5V, P ≈ 9.555d).Methods. We performed new low-resolution spectroscopic observations of WR 127 with the 2.5 m CMO SAI telescope to construct the radial velocity curves of the components. Our results suggest component masses of MWRsin3(i) = 11.8 ± 1.4 M⊙ and MOsin3(i) = 17.2 ± 1.4 M⊙
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The radiative and dynamical impact of clouds in the atmosphere of the hot Jupiter WASP-43 b Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-22 L. Teinturier, B. Charnay, A. Spiga, B. Bézard, J. Leconte, A. Mechineau, E. Ducrot, E. Millour, N. Clément
Context. Hot Jupiters are tidally locked gaseous exoplanets that exhibit large day-night temperature contrasts. Their cooler nightsides are thought to host clouds, as has been suggested by numerous observations. However, the exact nature of these clouds, their spatial distribution, and their impact on atmospheric dynamics, thermal structure, and spectra is still unclear.Aims. We investigate the atmosphere
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Radio outburst from a massive (proto)star Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-20 R. Cesaroni, L. Moscadelli, A. Caratti o Garatti, J. Eislöffel, R. Fedriani, R. Neri, T. Ray, A. Sanna, B. Stecklum
We report new Very Large Array high-resolution observations of the radio jet from the outbursting high-mass star S255IR NIRS 3. The images at 6, 10, and 22.2 GHz confirm the existence of a new lobe emerging to the SW and expanding at a mean speed of ∼285 km s−1, about half as fast as the NE lobe. The new data allow us to reproduce both the morphology and the continuum spectrum of the two lobes with
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Spatially resolving the AGB star V3 in the metal-poor globular cluster 47 Tuc with VLTI/GRAVITY⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-18 K. Ohnaka, G. Weigelt, K.-H. Hofmann, D. Schertl
Context. Mass loss at the asymptotic giant branch (AGB) plays an important role not only in the final fates of stars, but also in the chemical evolution of galaxies. Nevertheless, the metallicity effects on AGB mass loss are not yet fully understood.Aims. We present spatially resolved observations of an AGB star, V3, in the metal-poor globular cluster 47 Tuc (NGC 104).Methods. The AGB star 47 Tuc V3
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Gaia’s brightest very metal-poor (VMP) stars Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-15 Akshara Viswanathan, Else Starkenburg, Tadafumi Matsuno, Kim A. Venn, Nicolas F. Martin, Nicolas Longeard, Anke Ardern-Arentsen, Raymond G. Carlberg, Sébastien Fabbro, Georges Kordopatis, Martin Montelius, Federico Sestito, Zhen Yuan
Context. Gaia DR3 has offered the scientific community a remarkable dataset of approximately one million spectra acquired with the radial velocity spectrometer (RVS) in the calcium II triplet region, which is well suited to identify very metal-poor (VMP) stars. However, over 40% of these spectra have no released parameters by Gaia’s GSP-Spec pipeline in the domain of VMP stars, whereas VMP stars are
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The SRG/eROSITA All-Sky Survey Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-13 A. Liu, E. Bulbul, M. Kluge, V. Ghirardini, X. Zhang, J. S. Sanders, E. Artis, Y. E. Bahar, F. Balzer, M. Brüggen, N. Clerc, J. Comparat, C. Garrel, E. Gatuzz, S. Grandis, G. Lamer, A. Merloni, K. Migkas, K. Nandra, P. Predehl, M. E. Ramos-Ceja, T. H. Reiprich, R. Seppi, S. Zelmer
Superclusters of galaxies mark the large-scale overdense regions in the Universe. Superclusters provide an ideal environment to study structure formation and to search for the emission of the intergalactic medium such as cosmic filaments and WHIM. In this work, we present the largest-to-date catalog of X-ray-selected superclusters identified in the first SRG/eROSITA All-Sky Survey (eRASS1). By applying
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Evidence of extended [CII] and dust emission in local dwarf galaxies Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-13 M. Romano, D. Donevski, Junais Junais, A. Nanni, M. Ginolfi, G. C. Jones, I. Shivaei, G. Lorenzon, M. Hamed, D. Salak, P. Sawant
Aims. The evolution of dwarf galaxies is dramatically affected by gaseous and dusty outflows, which can easily deprive their interstellar medium of the material needed for the formation of new stars, simultaneously enriching their surrounding circumgalactic medium (CGM). In this Letter, we present the first evidence of extended [CII] 158 μm line and dust continuum emission in local dwarf galaxies hosting
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The astrophysical parameters of chemically peculiar stars from automatic methods Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-13 E. Paunzen
Context. The chemically peculiar (CP) stars of the upper main sequence are excellent astrophysical laboratories for investigating the diffusion, mass loss, rotational mixing, and pulsation in the presence and absence of a stable local magnetic field. For this, we need a homogeneous set of parameters, such as effective temperature (Teff) and surface gravity (log g), to locate the stars in the Hertzsprung-Russell
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A newborn active galactic nucleus in a star-forming galaxy Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-13 P. Arévalo, E. López-Navas, M. L. Martínez-Aldama, P. Lira, S. Bernal, P. Sánchez-Sáez, M. Salvato, L. Hernández-García, C. Ricci, A. Merloni, M. Krumpe
Aims. We report on the finding of a newborn active galactic nucleus (AGN), based on the observation of current AGN activity in a galaxy previously classified as non-active. We subsequently characterize the AGN’s evolution.Methods. Black hole ignition event candidates were selected from a parent sample of spectrally classified non-active galaxies (2 394 312 objects), which currently show optical flux
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Four new eclipsing accreting ultracompact white dwarf binaries found with the Zwicky Transient Facility Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-13 J. M. Khalil, J. van Roestel, E. C. Bellm, J. S. Bloom, R. Dekany, A. J. Drake, M. J. Graham, S. L. Groom, S. R. Kulkarni, R. R. Laher, A. A. Mahabal, T. Prince, R. Riddle
Context. Accreting ultracompact white dwarf binaries contain a white dwarf that is accreting from a degenerate object. They have orbital periods shorter than 65 min.Aims. We report the discovery and the orbital period of four new eclipsing accreting ultracompact white dwarf binaries found using the Zwicky Transient Facility (ZTF) and discuss their photometric properties.Methods. We searched through
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Possible Hycean conditions in the sub-Neptune TOI-270 d Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-07 Måns Holmberg, Nikku Madhusudhan
The JWST has ushered in a new era in atmospheric characterisations of temperate low-mass exoplanets with recent detections of carbon-bearing molecules in the candidate Hycean world K2-18 b. We investigated JWST observations of the TOI-270 system, with two sub-Neptunes simultaneously transiting the nearby M dwarf during the visit. We report our atmospheric characterisation of the outer planet TOI-270
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TeV flaring activity of the AGN PKS 0625–354 in November 2018 Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-06 F. Aharonian, F. Ait Benkhali, J. Aschersleben, H. Ashkar, M. Backes, A. Baktash, V. Barbosa Martins, J. Barnard, R. Batzofin, Y. Becherini, D. Berge, K. Bernlöhr, B. Bi, M. Böttcher, C. Boisson, J. Bolmont, M. de Bony de Lavergne, J. Borowska, F. Bradascio, M. Breuhaus, R. Brose, A. Brown, F. Brun, B. Bruno, T. Bulik, C. Burger-Scheidlin, T. Bylund, S. Caroff, S. Casanova, R. Cecil, J. Celic, M. Cerruti
Most γ-ray detected active galactic nuclei are blazars with one of their relativistic jets pointing towards the Earth. Only a few objects belong to the class of radio galaxies or misaligned blazars. Here, we investigate the nature of the object PKS 0625−354, its γ-ray flux and spectral variability and its broad-band spectral emission with observations from H.E.S.S., Fermi-LAT, Swift-XRT, and UVOT taken
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Lithium-rich Cepheid V470 Cas⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-06 R. P. Martin, V. V. Kovtyukh, S. M. Andrievsky, S. A. Korotin
Aims. In this Letter, we report the discovery of a new lithium-rich yellow supergiant star – the Cepheid V470 Cas – that has a high lithium abundance, log A(Li) = 3.29. This is highly unusual for supergiant stars. V470 Cas is joining a very select group of lithium-rich Cepheids, with only nine members known to date in our Galaxy.Methods. For the analysis of our high-resolution echelle spectrum obtained
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Revealing the characteristics of the dark GRB 150309A: Dust extinguished or high-z?⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-04 A. J. Castro-Tirado, R. Gupta, S. B. Pandey, A. Nicuesa Guelbenzu, S. Eikenberry, K. Ackley, A. Gerarts, A. F. Valeev, S. Jeong, I. H. Park, S. R. Oates, B.-B. Zhang, R. Sánchez-Ramírez, A. Martín-Carrillo, J. C. Tello, M. Jelínek, Y.-D. Hu, R. Cunniffe, V. V. Sokolov, S. Guziy, P. Ferrero, M. D. Caballero-García, A. K. Ror, A. Aryan, M. A. Castro Tirado, E. Fernández-García, M. Gritsevich, I. Olivares
Context. Dark gamma-ray bursts (GRBs) constitute a significant fraction of the GRB population. In this paper, we present a multi-wavelength analysis (both prompt emission and afterglow) of an intense (3.98 × 10−5 erg cm−2 using Fermi-Gamma-Ray Burst Monitor) two-episodic GRB 150309A observed early on until ∼114 days post burst. Despite the strong gamma-ray emission, no optical afterglow was detected
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3C 273 host galaxy with Hubble Space Telescope coronagraphy⋆ Astron. Astrophys. (IF 6.5) Pub Date : 2024-03-01 Bin B. Ren, Kevin Fogarty, John H. Debes, Eileen T. Meyer, Youbin Mo, Dimitri Mawet, Marshall D. Perrin, Patrick M. Ogle, Johannes Sahlmann
The close-in regions of bright quasars’ host galaxies have been difficult to image due to the overwhelming light coming from quasars. With coronagraphic observations in visible light using the Space Telescope Imaging Spectrograph (STIS) on the Hubble Space Telescope, we removed 3C 273 quasar light using color-matching reference stars. The observations revealed the host galaxy from 60″ to 0.″2 with
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Angular momentum and chemical transport by azimuthal magnetorotational instability in radiative stellar interiors Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-29 Domenico G. Meduri, Laurène Jouve, François Lignières
Context. The transport of angular momentum and chemical elements within evolving stars remains poorly understood. Asteroseismic and spectroscopic observations of low-mass main sequence stars and red giants reveal that their radiative cores rotate orders of magnitude slower than classical predictions from stellar evolution models and that the abundances of their surface light elements are too small
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Discovery of the first olivine-dominated A-type asteroid family Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-29 M. Galinier, M. Delbo, C. Avdellidou, L. Galluccio
The classical theory of differentiation states that due to the heat generated by the decay of radioactive elements, some asteroids form an iron core, an olivine-rich mantle, and a crust. The collisional breakup of these differentiated bodies is expected to lead to exposed mantle fragments, creating families of newly-formed asteroids. Among these new objects, some are expected to show an olivine-rich
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Cosmic Vine: A z = 3.44 large-scale structure hosting massive quiescent galaxies Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-29 Shuowen Jin, Nikolaj B. Sillassen, Georgios E. Magdis, Malte Brinch, Marko Shuntov, Gabriel Brammer, Raphael Gobat, Francesco Valentino, Adam C. Carnall, Minju Lee, Aswin P. Vijayan, Steven Gillman, Vasily Kokorev, Aurélien Le Bail, Thomas R. Greve, Bitten Gullberg, Katriona M. L. Gould, Sune Toft
We report the discovery of a large-scale structure at z = 3.44 revealed by JWST data in the Extended Groth Strip (EGS) field. This structure, called the Cosmic Vine, consists of 20 galaxies with spectroscopic redshifts at 3.43 < z < 3.45 and six galaxy overdensities (4 − 7σ) with consistent photometric redshifts, making up a vine-like structure extending over a ∼4 × 0.2 pMpc2 area. The two most massive
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Meteoroid rotation and quasi-periodic brightness variation of meteor light curves Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-28 Salvatore Mancuso, Dario Barghini, Daniele Gardiol
Meteor light curves are sometimes known to display flickering: rapid, quasi-periodic variations in brightness. This effect is generally attributed to the rotational modulation of the ablation rate, which is caused by the time-varying cross section area presented by a nonspherical rotating meteoroid to the oncoming airflow. In this work we investigate the effects that the rotation of a meteoroid of
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Ubiquitous broad-line emission and the relation between ionized gas outflows and Lyman continuum escape in Green Pea galaxies Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-27 R. O. Amorín, M. Rodríguez-Henríquez, V. Fernández, J. M. Vílchez, R. Marques-Chaves, D. Schaerer, Y. I. Izotov, V. Firpo, N. Guseva, A. E. Jaskot, L. Komarova, D. Muñoz-Vergara, M. S. Oey, O. Bait, C. Carr, J. Chisholm, H. Ferguson, S. R. Flury, M. Giavalisco, M. J. Hayes, A. Henry, Z. Ji, W. King, F. Leclercq, G. Östlin, L. Pentericci, A. Saldana-Lopez, T. X. Thuan, M. Trebitsch, B. Wang, G. Worseck
We report observational evidence of highly turbulent ionized gas kinematics in a sample of 20 Lyman continuum (LyC) emitters (LCEs) at low redshift (z ∼ 0.3). Detailed Gaussian modeling of optical emission line profiles in high-dispersion spectra consistently shows that both bright recombination and collisionally excited lines can be fitted as one or two narrow components with intrinsic velocity dispersion
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Constraints on the evolution of the Triton atmosphere from occultations: 1989–2022 Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-27 B. Sicardy, A. Tej, A. R. Gomes-Júnior, F. D. Romanov, T. Bertrand, N. M. Ashok, E. Lellouch, B. E. Morgado, M. Assafin, J. Desmars, J. I. B. Camargo, Y. Kilic, J. L. Ortiz, R. Vieira-Martins, F. Braga-Ribas, J. P. Ninan, B. C. Bhatt, S. Pramod Kumar, V. Swain, S. Sharma, A. Saha, D. K. Ojha, G. Pawar, S. Deshmukh, A. Deshpande, S. Ganesh, J. K. Jain, S. K. Mathew, H. Kumar, V. Bhalerao, G. C. Anupama
Context. In about 2000, the south pole of Triton experienced an extreme summer solstice that occurs every ∼650 years, when the subsolar latitude reached about 50°S. Bracketing this epoch, a few occultations probed the Triton atmosphere in 1989, 1995, 1997, 2008, and 2017. A recent ground-based stellar occultation observed on 6 October 2022 provides a new measurement of the atmospheric pressure on Triton
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Disentangling the origin of chemical differences using GHOST Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-26 C. Saffe, P. Miquelarena, J. Alacoria, E. Martioli, M. Flores, M. Jaque Arancibia, R. Angeloni, E. Jofré, J. Yana Galarza, E. González, A. Collado
Aims. We explore different scenarios to explain the chemical difference found in the remarkable giant-giant binary system HD 138202 + CD−30 12303. For the first time, we suggest how to distinguish these scenarios by taking advantage of the extensive convective envelopes of giant stars.Methods. We carried out a high-precision determination of stellar parameters and abundances by applying a full line-by-line
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FR0 jets and recollimation-induced instabilities Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-26 A. Costa, G. Bodo, F. Tavecchio, P. Rossi, A. Capetti, S. Massaglia, A. Sciaccaluga, R. D. Baldi, G. Giovannini
Context. The recently discovered population of faint Fanaroff-Riley type 0 (FR0) radio galaxies has been interpreted as the extension to low power of the classical FRI sources. Their radio emission appears to be concentrated in very compact parsec scale cores, any extended emission is very weak or absent, and very-long-baseline interferometry (VLBI) observations show that jets are already mildly or
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Bayesian test of Brans–Dicke theories with planetary ephemerides: Investigating the strong equivalence principle Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-23 V. Mariani, O. Minazzoli, A. Fienga, J. Laskar, M. Gastineau
Aims. We are testing the Brans–Dicke class of scalar tensor theories with planetary ephemerides.Methods. In this work, we apply our recently proposed Bayesian methodology to the Brans–Dicke case, with an emphasis on the issue of the strong equivalence principle (SEP).Results. We use an MCMC approach coupled to full, consistent planetary ephemeris construction (from point-mass body integration to observational
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SN 2022jli: The ultraluminous birth of a low-mass X-ray binary Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-23 Andrew King, Jean-Pierre Lasota
Observations show that the 12.4 d binary system descending from the recent supernova SN 2022jli closely fits hypotheses of how low-mass X-ray binaries form, but requires an apparently super-Eddington accretion luminosity from the accreting component. We show that this agrees very well with the type of accretion-induced beaming found in ultraluminous X-ray sources, as recently strongly confirmed by
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Observations of the new meteor shower from comet 46P/Wirtanen Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-23 D. Vida, J. M. Scott, A. Egal, J. Vaubaillon, Q.-Z. Ye, D. Rollinson, M. Sato, D. E. Moser
Context. A new meteor shower λ-Sculptorids produced by the comet 46P/Wirtanen was forecast for December 12, 2023. The predicted activity was highly uncertain, but generally considered to be low. Observations in Australia, New Zealand, and Oceania were solicited to help constrain the size distribution of meteoroids in the shower.Aims. This work aims to characterize the new meteor shower, by comparing
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Introducing LensCharm Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-15 Julian Rüstig, Matteo Guardiani, Jakob Roth, Philipp Frank, Torsten Enßlin
Strong gravitational lensing, a phenomenon rooted in the principles of general relativity, grants us a unique window into the distant cosmos by offering a direct probe into dark matter and providing independent constraints on the Hubble constant. These research objectives call for the utmost precision in the estimation of the lens mass and the source brightness distributions. Recent strides in telescope
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Searching for pairs of actively accreting supermassive black holes in the Gaia FPR GravLens catalog Astron. Astrophys. (IF 6.5) Pub Date : 2024-02-13 C. Mahé, E. Slezak, L. Galluccio
Observational data on dual supermassive black holes (SMBHs) are scarce, even though they should be common according to the current hierarchical formation model for galaxies. We present hereby a method to detect such dual systems, involving an already known quasar, as two luminosity peaks with angular separations smaller than one arcsecond (1″). It is based on the analysis of the spatial distribution