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2018ApJ...869..113D - Astrophys. J., 869, 113-113 (2018/December-3)

Black hole mass scaling relations for spiral galaxies. II. MBH-M*,tot and MBH-M*,disk.


Abstract (from CDS):

Black hole mass (MBH) scaling relations are typically derived using the properties of a galaxy's bulge and samples dominated by (high-mass) early-type galaxies. Studying late-type galaxies should provide greater insight into the mutual growth of black holes and galaxies in more gas-rich environments. We have used 40 spiral galaxies to establish how MBH scales with both the total stellar mass (M_* ,tot_) and the disk's stellar mass, having measured the spheroid (bulge) stellar mass (M_* ,sph_) and presented the MBH-M_* ,sph_ relation in Paper I. The relation involving M_* ,tot_ may be beneficial for estimating MBH either from pipeline data or at higher redshift, conditions that are not ideal for the accurate isolation of the bulge. A symmetric Bayesian analysis finds log(MBH/M)=(3.05–0.49+0.57)log\M_* ,tot_/[υ(6.37×1010M)]+(7.25–0.14+0.13). The scatter from the regression of MBH on M_* ,tot_ is 0.66 dex; compare 0.56 dex for MBH on M_* ,sph_ and 0.57 dex for MBH on σ*. The slope is >2 times that obtained using core-Sersic early-type galaxies, echoing a similar result involving M_* ,sph_, and supporting a varied growth mechanism among different morphological types. This steeper relation has consequences for galaxy/black hole formation theories, simulations, and predicting black hole masses. We caution that (i) an MBH-M_* ,tot_ relation built from a mixture of early- and late-type galaxies will find an arbitrary slope of approximately 1-3, with no physical meaning beyond one's sample selection, and (ii) evolutionary studies of the MBH-M_* ,tot_ relation need to be mindful of the galaxy types included at each epoch. We additionally update the M_* ,tot_-(face-on spiral arm pitch angle) relation.

Abstract Copyright: © 2018. The American Astronomical Society. All rights reserved.

Journal keyword(s): black hole physics - galaxies: bulges - galaxies: evolution - galaxies: fundamental parameters - galaxies: spiral - galaxies: structure

Simbad objects: 45

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