Changing look quasars from tidal disruption flares. (arXiv:2003.07365v1 [astro-ph.GA])
<a href="http://arxiv.org/find/astro-ph/1/au:+Padmanabhan_H/0/1/0/all/0/1">Hamsa Padmanabhan</a> (CITA), <a href="http://arxiv.org/find/astro-ph/1/au:+Loeb_A/0/1/0/all/0/1">Abraham Loeb</a> (Harvard)

We explore the contributions of Tidal Disruption Events (TDEs) as potential
triggers for Active Galactic Nuclei (AGN). Using the latest data available from
X-ray and optical observations of high-redshift galaxies, as well as the
evolution of their central supermassive black holes, we calculate the extent to
which TDEs trigger AGN as a function of their luminosities. We find that at low
redshifts ($z < 1$), a few percent of all AGN with bolometric luminosities
$L_{rm Bol} lesssim 10^{44}$ erg s$^{-1}$ may be attributable to TDE
triggers. However, this fraction can significantly increase at earlier cosmic
times, reaching several tens of percent at $z > 2$, including about 20-50% of
the observed population of Changing Look Quasars (CLQs). TDEs may comprise a
significant fraction of the Compton-Thick (CT) AGN population at $z > 2$. The
above findings motivate further calibration from upcoming X-ray missions and
spectroscopic surveys targeting TDE-AGN.

We explore the contributions of Tidal Disruption Events (TDEs) as potential
triggers for Active Galactic Nuclei (AGN). Using the latest data available from
X-ray and optical observations of high-redshift galaxies, as well as the
evolution of their central supermassive black holes, we calculate the extent to
which TDEs trigger AGN as a function of their luminosities. We find that at low
redshifts ($z < 1$), a few percent of all AGN with bolometric luminosities
$L_{rm Bol} lesssim 10^{44}$ erg s$^{-1}$ may be attributable to TDE
triggers. However, this fraction can significantly increase at earlier cosmic
times, reaching several tens of percent at $z > 2$, including about 20-50% of
the observed population of Changing Look Quasars (CLQs). TDEs may comprise a
significant fraction of the Compton-Thick (CT) AGN population at $z > 2$. The
above findings motivate further calibration from upcoming X-ray missions and
spectroscopic surveys targeting TDE-AGN.

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