Abstract

This paper is an extension of the study by Khamitov et al. (2022) with regard to the catalog and the astrophysical interpretation of the imitation of significant proper motions in active galactic nuclei (AGNs) and quasars based on data from the Gaia space observatory. We present a sample of SRG/eROSITA X-ray sources in the eastern Galactic hemisphere (\({0^{\circ}<l<180^{\circ}}\)) having significant proper motions in the Gaia EDR3 measurements with the confirmed extragalactic nature of the objects. The catalog consists of 248 extragalactic sources with spectroscopically measured redshifts. The catalog includes all of the objects available in the SIMBAD database and coincident with the identified optical counterpart within 0.5 arcsec. Eighteen sources with spectroscopically measured redshifts from observations with the Russian–Turkish 1.5-m telescope RTT-150 (Khamitov et al. 2022) have been additionally included in the catalog. The sources in the catalog are AGNs of various types (Sy1, Sy2, LINER), quasars, radio galaxies, and star-forming galaxies. The imitation of significant proper motions can be explained (by the VIM effect previously known in astrometry) by the presence of transient events on the line of sight in the vicinity of AGNs and quasars (within the Gaia optical resolution element). Among such astrophysical events are supernova outbursts, tidal disruption events in binary AGNs, the variability of high-mass supergiants, the presence of OB associations against the background of AGNs with a variable brightness, etc. The model of outbursts with a fast rise–exponential decay profile allows the variable positional parameters of most sources observed in Gaia to be described. This approach can be used as an independent way of detecting transient events in the vicinity of AGNs (on scales of several hundred parsecs in the plane of the sky) based on data from the SRG/eROSITA catalogs of X-ray sources and the optical Gaia catalog.

中文翻译：

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活动星系核和类星体核周区域的瞬态事件作为固有运动模仿的来源

摘要

本文是 Khamitov 等人研究的延伸。（2022）关于基于盖亚空间观测站的数据对活动星系核（AGN）和类星体中显着自行运动的模拟的目录和天体物理学解释。我们提出了银河系东半球 SRG/eROSITA X 射线源的样本 ( \({0^{\circ}<l<180^{\circ}}\) )，在 Gaia EDR3 测量中具有显着的自行已确认的物体的河外性质。该目录由 248 个具有光谱测量红移的河外源组成。该目录包括 SIMBAD 数据库中可用的所有物体，并且与 0.5 弧秒内识别的光学对应物一致。目录中还包含了 18 个通过俄罗斯-土耳其 1.5 米望远镜 RTT-150（Khamitov 等人，2022）观测得到的红移源。目录中的源是各种类型的活动星系核（Sy1、Sy2、LINER）、类星体、射电星系和恒星形成星系。显着自行的模仿可以通过活动星系核和类星体（在盖亚光学分辨率元件内）附近视线上存在瞬态事件来解释（通过天体测量学中先前已知的 VIM 效应）。这些天体物理事件包括超新星爆发、双星活动星系核中的潮汐破坏事件、大质量超巨星的变化、亮度可变的活动星系核背景下OB关联的存在等。快速指数上升的爆发模型衰变剖面允许描述盖亚中观察到的大多数源的可变位置参数。这种方法可以作为一种独立的方法，根据来自 X 射线源 SRG/eROSITA 目录和光学盖亚的数据，检测 AGN 附近的瞬态事件（在天空平面中数百秒差距的尺度上）目录。