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2011MNRAS.412.2211G - Mon. Not. R. Astron. Soc., 412, 2211-2228 (2011/April-3)
An expanded mbh–σ diagram, and a new calibration of active galactic nuclei masses.
GRAHAM A.W., ONKEN C.A., ATHANASSOULA E. and COMBES F.
Abstract (from CDS):
Using updated virial products and velocity dispersions from 28 active galactic nuclei, we determine that the optimal scaling factor f- which brings their virial products in line with the 64 directly measured black hole masses - is 2.8+0.7–0.5. This is roughly half the value reported by Onken et al. and Woo et al., and consequently halves the mass estimates of most high-redshift quasars. Given that barred galaxies are, on average, located ∼0.5 dex below the `barless' and `elliptical-only'Mbh-σ relations, we have explored the results after separating the samples into barred and non-barred galaxies, and we have also developed a preliminary corrective term to the velocity dispersion based on bar dynamics. In addition, given the recently recognized coexistence of massive black holes and nuclear star clusters, we present the first ever (Mbh+Mnc)-σ diagram and begin to explore how galaxies shift from their former location in the Mbh-σ diagram. Probing gamma-ray burst environments with time variability: ULTRASPEC fast imaging of GRB 080210
Abstract Copyright: 2011 The Authors Monthly Notices of the Royal Astronomical Society2011 RAS
Journal keyword(s): black hole physics - catalogues - galaxies: active - galaxies: nuclei - quasars: general - galaxies: Seyfert
Simbad objects: 98
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