Astrophys. J., 876, 155-155 (2019/May-2)
Black hole mass scaling relations for early-type galaxies. I. MBH-M*,sph and MBH-M*,gal.
SAHU N., GRAHAM A.W. and DAVIS B.L.
Abstract (from CDS):
Analyzing a sample of 84 early-type galaxies (ETGs) with directly measured supermassive black hole masses-nearly doubling the sample size of such galaxies with multicomponent decompositions-a symmetric linear regression on the reduced (merger-free) sample of 76 galaxies reveals MBH∝M_* ,sph_^1.27±0.07^ with a total scatter of Δrms = 0.52 dex in the log(MBH) direction. Importantly, however, we discover that the ES/S0-type galaxies with disks are offset from the E-type galaxies by more than a factor of ten in their MBH/M_* ,sph_ ratio, with ramifications for formation theories, simulations, and some virial factor measurements used to convert AGN virial masses into MBH. Separately, each population follows a steeper relation with slopes of 1.86 ± 0.20 and 1.90 ± 0.20, respectively. The offset mass ratio is mainly due to the exclusion of the disk mass, with the two populations offset by only a factor of two in their MBH/M_* ,gal_ ratio in the MBH-M_* ,gal_ diagram where MBH∝M_* ,gal_^1.8±0.2^ and Δrms=0.6±0.1 dex depending on the sample. For MBH≳107M☉, we detect no significant bend nor offset in either the MBH-M_* ,sph_ or MBH-M_* ,gal_ relations due to barred versus non-barred, or core-Sersic versus Sersic, ETGs. For reference, the ensemble of late-type galaxies (which invariably are Sersic galaxies) follow MBH-M_* ,sph_ and MBH-M_* ,gal_ relations with slopes equal to 2.16 ± 0.32 and 3.05 ± 0.70, respectively. Finally, we provide some useful conversion coefficients, υ, accounting for the different stellar mass-to-light ratios used in the literature, and we report the discovery of a local, compact massive spheroid in NGC 5252.
© 2019. The American Astronomical Society. All rights reserved.
black hole physics - galaxies: bulges - galaxies: elliptical and lenticular, cD - galaxies: evolution - galaxies: photometry - galaxies: structure
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