Mon. Not. R. Astron. Soc., 471, 1694-1708 (2017/October-3)
Black hole masses of tidal disruption event host galaxies.
WEVERS T., VAN VELZEN S., JONKER P.G., STONE N.C., HUNG T., ONORI F., GEZARI S. and BLAGORODNOVA N.
Abstract (from CDS):
The mass of the central black hole in a galaxy that hosted a tidal disruption event (TDE) is an important parameter in understanding its energetics and dynamics. We present the first homogeneously measured black hole masses of a complete sample of 12 optically/UV-selected TDE host galaxies (down to ghost <= 22 mag and z = 0.37) in the Northern sky. The mass estimates are based on velocity dispersion measurements, performed on late time optical spectroscopic observations. We find black hole masses in the range of 3 x 105 M☉ <= MBH <= 2 x 107 M☉. The TDE host galaxy sample is dominated by low-mass black holes (∼ 106 M☉), as expected from theoretical predictions. The blackbody peak luminosity of TDEs with MBH <= 107.1 M☉ is consistent with the Eddington limit of the supermassive black hole (SMBH), whereas the two TDEs with MBH >= 107.1 M☉ have peak luminosities below their SMBH Eddington luminosity, in line with the theoretical expectation that the fallback rate for MBH >= 107.1 M☉ is sub-Eddington. In addition, our observations suggest that TDEs around lower mass black holes evolve faster. These findings corroborate the standard TDE picture in 106 M☉ black holes. Our results imply an increased tension between observational and theoretical TDE rates. By comparing the blackbody emission radius with theoretical predictions, we conclude that the optical/UV emission is produced in a region consistent with the stream self-intersection radius of shallow encounters, ruling out a compact accretion disc as the direct origin of the blackbody radiation at peak brightness.
© 2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society
accretion, accretion discs - galaxies: bulges - galaxies: fundamental parameters - galaxies: kinematics and dynamics - galaxies: nuclei - galaxies: nuclei
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