Contribution of Flares from Tidal Disruption of Stars to high-redshift AGN

Abstract

We explore the contributions 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 $L_{\mathrm{Bol}}\lesssim 10^{44}$ 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 $z\gtrsim 3$. TDEs may comprise a significant fraction of the Compton-Thick (CT) AGN population at $z\gtrsim 3$. The above findings motivate further calibration with upcoming X-ray missions and spectroscopic surveys targeting TDE-AGN.

6 pages, 5 figures; accepted for publication in A&A

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• Growth of A Massive Black Hole Via Tidal Disruption Accretion