KFU. Card publication. Search for Tidal Disruption Events Based on the SRG/eROSITA Survey with Subsequent Optical Spectroscopy

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SEARCH FOR TIDAL DISRUPTION EVENTS BASED ON THE SRG/EROSITA SURVEY WITH SUBSEQUENT OPTICAL SPECTROSCOPY

Form of presentation

Articles in international journals and collections

Year of publication

2022

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Authors, employees of KFU

Bikmaev Ilfan Fyaritovich, author

Bibliographic description in the original language

Khorunzhev G.A, Sazonov S.Y, Medvedev P.S, Search for Tidal Disruption Events Based on the SRG/eROSITA Survey with Subsequent Optical Spectroscopy//Astronomy Letters. - 2022. - Vol.48, Is.12. - P.767-789.

Annotation

The four completed six-month sky surveys with the eROSITA telescope onboard the SRG orbital observatory allow tidal disruption events (TDEs) in galactic nuclei to be searched for by their X-ray variability. In this case, variable active galactic nuclei (AGNs) are detected in much larger quantities, for the elimination of which fairly stringent criteria have to be used. Some TDEs can be missed or misclassified as probable AGNs. Optical spectroscopy needs to be performed for the final identification of TDEs among the extragalactic SRG/eROSITA transients. We consider a set of criteria by which TDEs can be distinguished from AGNs based on optical spectra and photometric information. In particular, we propose to use the ratio of the X-ray luminosity to the [O III] 5007 Å luminosity. To test the proposed method, we consider a sample of 15 extragalactic SRG/eROSITA transients whose X-ray flux changed by more than a factor of 7 between two adjacent surveys. Spectra have been taken for all these objects with Russian optical telescopes: RTT-150, AZT-33IK, RC2500, and BTA. We have managed to reveal five new and one previously known TDEs and to classify seven sources as AGNs. The nature of two more transients remains in question. The proposed method will help to set priorities to obtain a maximally complete and reliable sample of TDEs in the SRG/eROSITA survey.

Keywords

tidal disruption events; active galactic nuclei; X-ray surveys; spectroscopy; SRG; eROSITA

The name of the journal

Astronomy Letters

URL

https://www.scopus.com/inward/record.uri?eid=2-s2.0-85150935099&doi=10.1134%2fS1063773723010036&partnerID=40&md5=c2c348615f067c3d67701fccfe491acd

Please use this ID to quote from or refer to the card

https://repository.kpfu.ru/eng/?p_id=286467&p_lang=2

Full metadata record

Field DC	Value	Language
dc.contributor.author	Bikmaev Ilfan Fyaritovich	ru_RU
dc.date.accessioned	2022-01-01T00:00:00Z	ru_RU
dc.date.available	2022-01-01T00:00:00Z	ru_RU
dc.date.issued	2022	ru_RU
dc.identifier.citation	Khorunzhev G.A, Sazonov S.Y, Medvedev P.S, Search for Tidal Disruption Events Based on the SRG/eROSITA Survey with Subsequent Optical Spectroscopy//Astronomy Letters. - 2022. - Vol.48, Is.12. - P.767-789.	ru_RU
dc.identifier.uri	https://repository.kpfu.ru/eng/?p_id=286467&p_lang=2	ru_RU
dc.description.abstract	Astronomy Letters	ru_RU
dc.description.abstract	The four completed six-month sky surveys with the eROSITA telescope onboard the SRG orbital observatory allow tidal disruption events (TDEs) in galactic nuclei to be searched for by their X-ray variability. In this case, variable active galactic nuclei (AGNs) are detected in much larger quantities, for the elimination of which fairly stringent criteria have to be used. Some TDEs can be missed or misclassified as probable AGNs. Optical spectroscopy needs to be performed for the final identification of TDEs among the extragalactic SRG/eROSITA transients. We consider a set of criteria by which TDEs can be distinguished from AGNs based on optical spectra and photometric information. In particular, we propose to use the ratio of the X-ray luminosity to the [O III] 5007 Å luminosity. To test the proposed method, we consider a sample of 15 extragalactic SRG/eROSITA transients whose X-ray flux changed by more than a factor of 7 between two adjacent surveys. Spectra have been taken for all these objects with Russian optical telescopes: RTT-150, AZT-33IK, RC2500, and BTA. We have managed to reveal five new and one previously known TDEs and to classify seven sources as AGNs. The nature of two more transients remains in question. The proposed method will help to set priorities to obtain a maximally complete and reliable sample of TDEs in the SRG/eROSITA survey.	ru_RU
dc.language.iso	ru	ru_RU
dc.subject		ru_RU
dc.title	Search for Tidal Disruption Events Based on the SRG/eROSITA Survey with Subsequent Optical Spectroscopy	ru_RU
dc.type	Articles in international journals and collections	ru_RU