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The First Distant X-ray Quasars (\(\boldsymbol{z\sim 4}\)) among the Sources Discovered by the eROSITA Telescope of the SRG Orbital Observatory during a Deep Lockman Hole Survey

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Abstract

During a deep extragalactic Lockman Hole sky survey with an area of 18.5 sq. deg, which was conducted when the SRG observatory was flying to the Lagrange point L2, the eROSITA telescope detected \({\sim}7000\) X-ray sources. These objects were then provisionally identified and classified using the publicly accessible data of optical and infrared sky surveys by the SRGz machine learning system developed for this purpose at the Space Research Institute of the Russian Academy of Sciences. As a result, a number of new candidates for distant quasars (\(z\sim 4\)) have been selected. The spectroscopic observations of the first two candidates from this list carried out with the 1.6-m AZT-33IK telescope of the Sayan Solar Observatory have confirmed that these objects are actually distant quasars at redshifts 3.878 and 4.116 and are characterized by a high X-ray luminosity \({\sim}10^{45}\) erg s\({}^{-1}\) (2–10 keV). The results obtained allow one to count on the detection of a large number of distant quasars during a four-year all-sky survey of the SRG observatory begun in December 2019.

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ACKNOWLEDGMENTS

The AZT-33IK observations were carried out using the equipment of the Angara Sharing Center http://ckp-rf.ru/ckp/3056. The operation of the AZT-33IK telescope is supported by the Basic Research Program II.16. The software, in particular, eSASS, developed at the Max-Planck-Institut für extraterrestrische Physik (Germany) was used in processing the SRG/eROSITA data. The Spectrum–RG (SRG) spacecraft was designed by the Lavochkin Research and Production Association (enters into the Roscosmos State Corporation). Spectrum–RG was produced with the participation of Germany within the Federal Space Program of Russia on the order of the Russian Academy of Sciences. The Spectrum–RG spacecraft is operated by the Lavochkin Research and Production Association.

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Authors and Affiliations

  1. Space Research Institute, Russian Academy of Sciences, Profsoyuznaya ul. 84/32, 117997, Moscow, Russia

    G. A. Khorunzhev, A. V. Meshcheryakov, R. A. Burenin, A. R. Lyapin, P. S. Medvedev, S. Yu. Sazonov, R. A. Sunyaev & M. R. Gilfanov

  2. Kazan Federal University, ul. Kremlevskaya 18, 420000, Kazan, Russia

    A. V. Meshcheryakov

  3. Institute of Solar–Terrestrial Physics, Russian Academy of Sciences, Siberian Branch, P.O. Box 4026, 664033, Irkutsk, Russia

    M. V. Eselevich

  4. Max Planck Institut für Astrophysik, Karl-Schwarzschild-Str. 1,Postfach 1317, D-85741, Garching, Germany

    R. A. Sunyaev & M. R. Gilfanov

Authors
  1. G. A. Khorunzhev
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  2. A. V. Meshcheryakov
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  3. R. A. Burenin
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  4. A. R. Lyapin
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  5. P. S. Medvedev
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  6. S. Yu. Sazonov
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  7. M. V. Eselevich
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  8. R. A. Sunyaev
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  9. M. R. Gilfanov
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Correspondence to G. A. Khorunzhev.

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Translated by V. Astakhov

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Khorunzhev, G.A., Meshcheryakov, A.V., Burenin, R.A. et al. The First Distant X-ray Quasars (\(\boldsymbol{z\sim 4}\)) among the Sources Discovered by the eROSITA Telescope of the SRG Orbital Observatory during a Deep Lockman Hole Survey. Astron. Lett. 46, 149–155 (2020). https://doi.org/10.1134/S1063773720030032

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  • DOI: https://doi.org/10.1134/S1063773720030032

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