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  Optical Spectroscopy of Quasars Discovered by SRG/eROSITA with a 2.5-m Telescope at the Caucasus Mountain Observatory of SAI MSU

Dodin, A. V., I.Shatsky, N., Belinski, A. A., Atapin, K. E., Burlak, M. A., Zheltoukhov, S. G., et al. (2022). Optical Spectroscopy of Quasars Discovered by SRG/eROSITA with a 2.5-m Telescope at the Caucasus Mountain Observatory of SAI MSU. Astronomy Letters - a Journal of Astronomy and Space Astrophysics, 47(10), 661-673. doi:10.1134/S1063773721100029.

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Dodin, A. V., Author
I.Shatsky, N., Author
Belinski, A. A., Author
Atapin, K. E., Author
Burlak, M. A., Author
Zheltoukhov, S. G., Author
Tatarnikov, A. M., Author
Postnov, K. A., Author
Cherepashchuk, A. M., Author
I.Belvedersky, M., Author
Borisov, V. D., Author
Burenin, R. A., Author
Gilfanov, M. R.1, Author           
Krivonos, R. A., Author
Medvedev, P. S., Author
Meshcheryakov, A. V., Author
Sazonov, S. Yu., Author
Sunyaev, R. A.1, Author           
Khorunzhev, G. A., Author
Affiliations:
1High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: Based on observations with the transient double-beam spectrograph (TDS) at the 2.5-m telescope of the Caucasus Mountain Observatory of SAI MSU, we have determined the redshifts for 15 new quasars detected in X-rays by the eROSITA telescope of the SRG orbital observatory during the first three all-sky surveys. The redshifts of the sources lie in the range 0.5–4.156. We have estimated the masses of the central supermassive black holes and the bolometric luminosities for eight quasars from the width of the C IV 1549 Å emission line and the continuum flux at 1350 Å. For these objects we have also estimated the ratio of the X-ray luminosity to the Eddington limit to be a few percent. At the same time, the bolometric-to-Eddington luminosity ratio for them has turned out to be in a fairly narrow range, 30–40%. A large Lbol/LEdd ratio points to an active growth of the mass of the central black holes in these objects.

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Language(s): eng - English
 Dates: 2022-01-17
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1134/S1063773721100029
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Title: Astronomy Letters - a Journal of Astronomy and Space Astrophysics
  Alternative Title : Astron. Lett.-J. Astron. Space Astrophys.
Source Genre: Journal
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Pages: - Volume / Issue: 47 (10) Sequence Number: - Start / End Page: 661 - 673 Identifier: ISSN: 1063-7737
ISSN: 1562-6873