paper

Black Hole Mass Scaling Relations for Early-Type Galaxies: - and -

arXiv:1903.04738 · doi:10.3847/1538-4357/ab0f32

Abstract

Analyzing a sample of 84 early-type galaxies with directly-measured super-massive black hole masses---nearly doubling the sample size of such galaxies with multi-component decompositions---a symmetric linear regression on the reduced (merger-free) sample of 76 galaxies reveals with a total scatter of 0.52 dex in the direction. However, and importantly, 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 ratio, with ramifications for formation theories, simulations, and some virial factor measurements used to convert AGN virial masses into . Separately, each population follows a steeper relation with slopes of and , 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 ratio in the - diagram where and dex depending on the sample. For , we detect no significant bend nor offset in either the - or - relations due to barred versus non-barred, or core-Sérsic versus Sérsic, early-type galaxies. For reference, the ensemble of late-type galaxies (which invariably are Sérsic galaxies) follow - and - relations with slopes equal to and , respectively. Finally, we provide some useful conversion coefficients, , 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.

73 pages, 53 figures, and 5 tables, accepted for publication by the Astrophysical Journal (11 March 2019)

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