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Black hole masses of tidal disruption event host galaxies

Wevers, Thomas ; van Velzen, Sjoert ; Jonker, Peter G ; Stone, Nicholas C ; Hung, Tiara ; Onori, Francesca ; Gezari, Suvi ; Blagorodnova, Nadejda

Monthly notices of the Royal Astronomical Society, 2017-10, Vol.471 (2), p.1694-1708 [Periódico revisado por pares]

Oxford University Press

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  • Título:
    Black hole masses of tidal disruption event host galaxies
  • Autor: Wevers, Thomas ; van Velzen, Sjoert ; Jonker, Peter G ; Stone, Nicholas C ; Hung, Tiara ; Onori, Francesca ; Gezari, Suvi ; Blagorodnova, Nadejda
  • É parte de: Monthly notices of the Royal Astronomical Society, 2017-10, Vol.471 (2), p.1694-1708
  • Descrição: Abstract 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 g host ≤ 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 × 105 M⊙ ≤ M BH ≤ 2 × 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 M BH ≤ 107.1 M⊙ is consistent with the Eddington limit of the supermassive black hole (SMBH), whereas the two TDEs with M BH ≥ 107.1 M⊙ have peak luminosities below their SMBH Eddington luminosity, in line with the theoretical expectation that the fallback rate for M BH ≥ 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.
  • Editor: Oxford University Press
  • Idioma: Inglês
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