Abstract
Results of the spectroscopic observations at the 1.5-m Russian–Turkish telescope for another group of 12 X-ray sources discovered by the eROSITA telescope onboard the SRG space observatory and identified by the SRGz machine learning system as candidates for distant X-ray quasars are presented. Ten objects have been confirmed as quasars at redshifts \(z=2.6{-}3.2\) and two sources have turned out to be active galactic nuclei (AGNs) at \(z=0.42\) and \(1.02\).
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REFERENCES
R. Ahumada, C. A. Prieto, A. Almeida, F. Anders, S. F. Anderson, B. H. Andrews, B. Anguiano, et al., Astrophys. J. Suppl. Ser. 249, 3 (2020).
I. F. Bikmaev, E. N. Irtuganov, E. A. Nikolaeva, N. A. Sakhibullin, R. I. Gumerov, A. S. Sklyanov, M. V. Glushkov, V. D. Borisov, et al., Astron. Lett. 46, 645 (2020).
A. G. A. Brown, A. Vallenari, T. Prusti, J. H. J. de Bruijne, C. Babusiaux, C. A. L. Bailer-Jones, M. Biermann, D. W. Evans, et al. (GAIA), Astron. Astrophys. 616, 1 (2018).
K. C. Chambers, E. A. Magnier, N. Metcalfe, H. A. Flewellng, M. E. Huber, C. Z. Waters, L. Denneau, P. W. Draper, et al., arXiv: 1612.05560 (2016).
A. Dey, D. J. Schlegel, D. Lang, R. Blum, K. Burleigh, X. Fan, J. R. Findlay, D. Finkbeiner, et al., Astron. J. 157, 168 (2019).
A. V. Dodin, S. A. Potanin, N. I. Shatsky, A. A. Belinski, K. E. Atapin, M. A. Burlak, O. V. Egorov, A. M. Tatarnikov, K. A. Postnov, and M. I. Belvedersky, Astron. Lett. 46, 429 (2020).
P. G. van Dokkum, Publ. Astron. Soc. Pacif. 113, 1420 (2001).
G. A. Khorunzhev, A. V. Meshcheryakov, R. A. Burenin, A. R. Lyapin, P. S. Medvedev, S. Yu. Sazonov, M. V. Eselevich, R. A. Syunyaev, and M. R. Gilfanov, Astron. Lett. 46, 149 (2020).
A. Meshcheryakov, V. Glazkova, S. Gerasimov, and I. Mashechkin, Astron. Lett. 44, 735 (2018).
A. Meshcheryakov et al., (2021, in preparation).
I. Paris, P. Petitjean, E. Aubourg, A. D. Myers, A. Streblyanska, B. W. Luke, S. F. Anderson, E. Armengaud, et al., Astron. Astrophys. 613, 51 (2018).
M. Pavlinsky, A. Tkachenko, V. Levin, N. Alexandrovich, V. Arefiev, V. Babushkin, O. Batanov, Yu. Bodnar, et al., arXiv: 2103.12479 (2021).
P. Predehl, R. Andritschke, V. Arefiev, V. Babushkin, O. Batanov, W. Becker, H. Becker, H. Boehringer, et al., Astron. Astrophys. 647, A1 (2021).
R. Sunyaev, V. Arefiev, V. Babushkin, V. Bogomolov, K. Borisov, M. Buntov, H. Brunner, R. Burenin, et al., arXiv e-prints arXiv:2104.13267(2021).
S. Yao, X.-B. Wu, Y. L. Ai, J. Yang, Q. Yang, X. Dong, R. Joshi, F. Wang, et al., Astrophys. J. Suppl. Ser. 240, 6 (2019).
H. Zou, X. Zhou, X. Fan, T. Zhang, Z. Zhou, X. Peng, J. Nie, L. Jiang, et al., Astrophys. J. Suppl. Ser. 245, 4 (2019).
ACKNOWLEDGMENTS
This work was supported by the subsidy (project no. 0671-2020-0052) allocated to the Kazan Federal University for the State assignment in the sphere of scientific activities. We are grateful to TÜBITAK, the Space Research Institute, the Kazan Federal University, and the Academy of Sciences of Tatarstan for their partial support in using RTT-150 (the Russian–Turkish 1.5-m telescope in Antalya).
This work is based on observations with the eROSITA telescope onboard the SRG observatory. The SRG observatory was built by Roskosmos in the interests of the Russian Academy of Sciences represented by its Space Research Institute (IKI) within the framework of the Russian Federal Space Program, with the participation of the Deutsches Zentrum fr̈ Luft- und Raumfahrt (DLR). The SRG/eROSITA X-ray telescope was built by a consortium of German institutes led by MPE, and supported by DLR. The SRG spacecraft was designed, built, launched, and is operated by the Lavochkin Association and its subcontractors. The science data are downlinked via the Deep Space Network Antennae in Bear Lakes, Ussurijsk, and Baykonur, funded by Roskosmos. The eROSITA data used in this work were processed using the eSASS software system developed by the German eROSITA consortium and the proprietary data reduction and analysis software developed by the Russian eROSITA Consortium. The SRGz system was created by the working group on the search for X-ray sources, their identification, and the production of a catalog based on eROSITA data at the Department of High-Energy Astrophysics of the Space Research Institute of the Russian Academy of Sciences.
The optical coordinates of the investigated sources from the GAIA DR3 catalog of the GAIA mission of the European Space Agency (https://www.cosmos.esa.int/gaia) were retrieved using the Aladin Sky Atlas system developed at the Strasbourg Data Center, the Strasbourg Observatory, France. The list of X-ray sources investigated in this work, as well as other sources discovered by the SRG space observatory telescopes, is available on the website of the astrophysical project at http://srg.cosmos.ru/objects.
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Bikmaev, I.F., Irtuganov, E.N., Nikolaeva, E.A. et al. Spectroscopic Redshift Determination for a Sample of Distant Quasars Detected by the SRG Observatory Based on RTT-150 Observations. II. Astron. Lett. 47, 277–290 (2021). https://doi.org/10.1134/S1063773721050029
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DOI: https://doi.org/10.1134/S1063773721050029