2019ApJ...876..155S

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 M_BH∝M_* ,sph_^1.27±0.07^ with a total scatter of Δ_rms = 0.52 dex in the log(M_BH) 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 M_BH/M_* ,sph_ ratio, with ramifications for formation theories, simulations, and some virial factor measurements used to convert AGN virial masses into M_BH. 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 M_BH/M_* ,gal_ ratio in the M_BH-M_* ,gal_ diagram where M_BH∝M_* ,gal_^1.8±0.2^ and Δ_rms=0.6±0.1 dex depending on the sample. For M_BH≳10⁷M_☉, we detect no significant bend nor offset in either the M_BH-M_* ,sph_ or M_BH-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 M_BH-M_* ,sph_ and M_BH-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.