2024ApJ...962L...7W

Query : 2024ApJ...962L...7W

2024ApJ...962L...7W - Astrophys. J., 962, L7 (2024/February-2)

Changing-look Active Galactic Nuclei Behavior Induced by Disk-captured Tidal Disruption Events.

WANG Y., LIN D.N.C., ZHANG B. and ZHU Z.

Abstract (from CDS):

Recent observations of changing-look active galactic nuclei (AGNs) hint at a frequency of accretion activity not fully explained by tidal disruption events (TDEs) stemming from relaxation processes in nuclear star clusters (NSCs), traditionally estimated to occur at rates of 10^–4-10^–5 yr^–1 per galaxy. In this Letter, we propose an enhanced TDE rate through the AGN disk capture process, presenting a viable explanation for the frequent transitions observed in changing-look AGNs. Specifically, we investigate the interaction between the accretion disk and retrograde stars within NSCs, resulting in the rapid occurrence of TDEs within a condensed time frame. Through detailed calculations, we derive the time-dependent TDE rates for both relaxation-induced TDE and disk-captured TDE. Our analysis reveals that TDEs triggered by the disk capture process can notably amplify the TDE rate by several orders of magnitude during the AGN phase. This mechanism offers a potential explanation for the enhanced high-energy variability characteristic of changing-look AGNs.

Journal keyword(s): AGN host galaxies - Active galactic nuclei - Black hole physics - Galaxy nuclei - Tidal disruption - X-ray transient sources

Simbad objects: 1

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Number of rows : 1

N	Identifier	Otype	ICRS (J2000) RA	ICRS (J2000) DEC	Mag U	Mag B	Mag V	Mag R	Mag I	Sp type	#ref 1850 - 2026	#notes
1	SDSS J155440.25+362952.0	QSO	15 54 40.2638373096	+36 29 51.977032152						~	29	0

Query : 2024ApJ...962L...7W

Basic data :

SDSS J155440.25+362952.0 -- Quasar

QSO (2020MNRAS), G (2012ApJS), * (Gaia), Opt (SDSS), ev (iPTF)

15 54 40.2638373096 +36 29 51.977032152 (Optical) [ 0.1132 0.1354 90 ] A 2020yCat.1350....0G

15 52 48.7189098427 +36 38 36.480726387 [ 0.1132 0.1354 90 ]

058.3444553578904 +50.3470125350110 [ 0.1132 0.1354 90 ]

0.097 -0.194 [0.141 0.195 90] A 2020yCat.1350....0G

V(km/s) 62779 [15] / z(spectroscopic) 0.23683 [0.00005] / cz 70999.8 [15.0] (Opt) C 2012ApJS..203...21A

G 18.783075 [0.009315] C 2020yCat.1350....0G

u (AB) 19.540 [0.036] C 2020ApJS..249....3A

g (AB) 19.101 [0.012] C 2012ApJS..203...21A

r (AB) 18.179 [0.008] B 2012ApJS..203...21A

i (AB) 17.696 [0.008] B 2012ApJS..203...21A

z (AB) 17.412 [0.018] C 2012ApJS..203...21A

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SDSS J155440.25+362952.0 iPTF 16bco Gaia DR2 1373132896008893184 Gaia DR3 1373132896008893184

References (29 between 1850 and 2026) (Total 29)
Simbad bibliographic survey began in 1850 for stars (at least bright stars) and in 1983 for all other objects (outside the solar system).

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Data at NED - NASA/IPAC Extragalactic Database : SDSS J155440.25+362952.0

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SDSS J155440.25+362952.0 Gaia DR2 1373132896008893184 Gaia DR3 1373132896008893184

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