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  First tidal disruption events discovered by SRG/eROSITA: X-ray/optical properties and X-ray luminosity function at z < 0.6

Sazonov, S., Gilfanov, M., Medvedev, P., Yao, Y., Khorunzhev, G., Semena, A., et al. (2021). First tidal disruption events discovered by SRG/eROSITA: X-ray/optical properties and X-ray luminosity function at z < 0.6. Monthly Notices of the Royal Astronomical Society, 508(3), 3820-3847. doi:10.1093/mnras/stab2843.

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Sazonov, S., Author
Gilfanov, M.1, Author           
Medvedev, P., Author
Yao, Y., Author
Khorunzhev, G., Author
Semena, A., Author
Sunyaev, R.1, Author           
Burenin, R., Author
Lyapin, A., Author
Meshcheryakov, A., Author
Uskov, G., Author
Zaznobin, I., Author
Postnov, K. A., Author
Dodin, A. V., Author
Belinski, A. A., Author
Cherepashchuk, A. M., Author
Eselevich, M., Author
Dodonov, S. N., Author
Grokhovskaya, A. A., Author
Kotov, S. S., Author
Bikmaev, I. F., AuthorZhuchkov, R. Ya., AuthorGumerov, R. I., Authorvan Velzen, S., AuthorKulkarni, S., Author more..
Affiliations:
1High Energy Astrophysics, MPI for Astrophysics, Max Planck Society, ou_159881              

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 Abstract: We present the first sample of tidal disruption events (TDEs) discovered during the SRG all-sky survey. These 13 events were selected among X-ray transients detected in the 0° < l < 180° hemisphere by eROSITA during its second sky survey (2020 June 10 to December 14) and confirmed by optical follow-up observations. The most distant event occurred at z = 0.581. One TDE continued to brighten at least 6 months. The X-ray spectra are consistent with nearly critical accretion on to black holes of a few ×10<sup>3</sup> to 10<sup>8</sup>M<sub>⊙</sub>⁠, although supercritical accretion is possibly taking place. In two TDEs, a spectral hardening is observed 6 months after the discovery. Four TDEs showed an optical brightening apart from the X-ray outburst. The other nine TDEs demonstrate no optical activity. All 13 TDEs are optically faint, with Lsub>g</sub>/L<sub>X</sub> < 0.3 (L<sub>g</sub> and L<sub>X</sub> being the g band and 0.2–6 keV luminosity, respectively). We have constructed a TDE X-ray luminosity function, which can be fit by a power law with a slope of −0.6 ± 0.2, similar to the trend observed for optically selected TDEs. The total rate is estimated at (1.1 ± 0.5) × 10<sup>−5</sup> TDEs per galaxy per year, an order of magnitude lower than inferred from optical studies. This suggests that X-ray bright events constitute a minority of TDEs, consistent with models predicting that X-rays can only be observed from directions close to the axis of a thick accretion disc formed from the stellar debris. Our TDE detection threshold can be lowered by a factor of ∼2, which should allow a detection of ∼700 TDEs by the end of the SRG survey.

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Language(s): eng - English
 Dates: 2021-10-05
 Publication Status: Published online
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 Rev. Type: Peer
 Identifiers: DOI: 10.1093/mnras/stab2843
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Title: Monthly Notices of the Royal Astronomical Society
  Abbreviation : Mon. Not. Roy. Astron. Soc.
Source Genre: Journal
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Pages: - Volume / Issue: 508 (3) Sequence Number: - Start / End Page: 3820 - 3847 Identifier: ISSN: 0035-8711
ISSN: 1365-8711