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RATAN-600 Beam Pattern and Drift Scans of Radio Sources in the Radio Telescope Operation Mode with the West Sector

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Abstract

The paper presents results of calculating the RATAN-600 beam pattern (BP) and BP drift scans of point radio sources in the West Sector radio telescope operation mode at a frequency of 4.7 GHz. When calculating the BP, the properties of the radio telescope antenna system in this operation mode were taken into account: the use of a large secondary mirror, asymmetric radiation of the primary mirror, and the location of the primary feeds (feed horns) along the focal line of the secondary mirror. The shape of the calculated drift scans of sources through the BP is compared with that of the experimental drift scans of sources obtained from observations in the West Sector. The main characteristics of the drift scans are calculated and compared when the radio telescope operates with the West and North Sectors. A new method for determination of flux densities of sources passing through the BP outside its central cross-section is proposed, and its accuracy is estimated.

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Notes

  1. https://www.sao.ru/hq/lrk/strlrk.html

  2. A point source is a source, whose sizes \(\Omega_{\textrm{source}}\) are much smaller than the dimensions of the BP antenna (\(\Omega_{\textrm{source}}\ll\Omega_{\textrm{DN}}\)).

  3. https://www.sao.ru/cats, https://www.sao.ru/cats/doc/CATS_descr.html

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ACKNOWLEDGMENTS

The work was carried out within the framework of the state assignment of the Special Astrophysical Observatory of the Russian Academy of Sciences (SAO RAS) approved by the Ministry of Science and Higher Education of the Russian Federation. The observed data partially were obtained with the unique scientific installation, the RATAN-600 radio telescope of SAO RAS, and the observed data were reduced within the framework of the grant of the Ministry of Science and Higher Education of the Russian Federation No. 075-15-2022-262 (13.MNPMU.21.0003). The CATS radio astronomy catalog database was used to build the radio spectra (https://www.sao.ru/cats/, https://www.sao.ru/cats/doc/CATS_descr.html). The paper used the FADPS radio astronomy data reduction system.

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  1. Special Astrophysical Observatory, Russian Academy of Sciences, 369167, Nizhnii Arkhyz, Russia

    E. K. Majorova, N. N. Bursov & S. A. Trushkin

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  1. E. K. Majorova
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  2. N. N. Bursov
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  3. S. A. Trushkin
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Correspondence to E. K. Majorova.

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Majorova, E.K., Bursov, N.N. & Trushkin, S.A. RATAN-600 Beam Pattern and Drift Scans of Radio Sources in the Radio Telescope Operation Mode with the West Sector. Astrophys. Bull. 78, 429–442 (2023). https://doi.org/10.1134/S1990341323700141

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  • DOI: https://doi.org/10.1134/S1990341323700141

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