The black hole mass – spheroid luminosity relation

By Alister W. Graham. 2007

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The differing Mbh-L relations presented in McLure & Dunlop, Marconi & Hunt and Erwin et al. have been investigated. A number of issues have been identified and addressed in each of these studies, including but not limited to: the removal of a dependency on the Hubble constant; a correction for dust attenuation in the bulges of disc galaxies; the identification of lenticular galaxies previously treated as elliptical galaxies; and application of the same (Y |X) regression analysis. These adjustments result in relations which now predict similar black hole masses. The optimal K-band relation is log(Mbh/M ⊙ ) = −0.37(±0.04)[MK + 24] + 8.29(±0.08), with a total (not intrinsic) scatter in log Mbh equal to 0.33 dex. This level of scatter is similar to the value of 0.34 dex from the Mbh-σ relation of Tremaine et al. and compares favourably with the value of 0.31 dex from the Mbh-n relation of Graham & Driver. Using different photometric data, consistent relations in the B- and R-band are also provided, although we do note that the small (N = 13) R-band sample used by Erwin et al. is found here to have a slope of −0.30 ± 0.06 and a total scatter of 0.31 dex. Performing a symmetrical regression on the larger K-band sample gives a slope of ∼ −0.40, implying Mbh ∝ L 1.00 . Implications for galaxy-black hole coevolution, in terms of dry mergers, are briefly discussed, as are the predictions for intermediate mass black holes. Finally, as previously noted by Tundo et al., a potential bias in the galaxy sample used to define the Mbh-L relations is shown and a corrective formula provided.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/4e64153613bc1d9bda43f6da983d8a3e28c3e5c3

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In Astronomy and Astrophysics

  1. L. Hernquist
  2. P. Hopkins
  3. D. M. Alexander
  4. Volker Springel
  5. Mara Salvato
  6. Thomas J. Cox
  7. Luis C. Ho
  8. A. Koekemoer

In Nuclear and High Energy Physics

  1. Alister W. Graham
  2. Nicholas Scott
  3. A. Merloni
  4. D. Weinberg
  5. Lee R. Spitler
  6. G. Risaliti
  7. C. Onken
  8. F. Combes

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