Contribution of flares from tidal disruptions of stars to high-redshift AGN
Abstract
We explore the contribution of tidal disruption events (TDEs) to the flares in Active Galactic Nuclei (AGN) at high redshifts. Using the latest data available from X-ray and optical observations of high-redshift galaxies, in combination with the evolution of their central supermassive black holes, we calculate the contribution of TDE to AGNs as a function of their luminosities. We find that at low redshifts (z < 1), a few percent of all AGN with bolometric luminosities LBol ≲ 1044 erg s−1 may be attributable to possible TDEs. However, this fraction can significantly increase at earlier cosmic times, including up to several tens of percent of the population of AGN at z ≳ 3. TDEs may comprise a significant fraction of the Compton-Thick AGN population at z ≳ 3. The above findings motivate further calibrations with upcoming X-ray missions and spectroscopic surveys targeting TDE-AGN.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- December 2021
- DOI:
- 10.1051/0004-6361/202040273
- arXiv:
- arXiv:2003.07365
- Bibcode:
- 2021A&A...656A..47P
- Keywords:
-
- galaxies: active;
- quasars: supermassive black holes;
- galaxies: high-redshift;
- Astrophysics - Astrophysics of Galaxies;
- Astrophysics - High Energy Astrophysical Phenomena
- E-Print:
- 6 pages, 5 figures