Populating the galaxy velocity dispersion - supermassive black hole mass diagram: A catalogue of (M_bh, sigma) values

TL;DR

This paper provides an updated catalogue of 76 galaxies with supermassive black hole masses and velocity dispersions, exploring their distribution and deviations in the M_bh-sigma relation, especially in barred and active galaxies.

Contribution

It offers an expanded dataset of black hole and velocity dispersion measurements and analyzes their distribution, highlighting differences in barred and active galaxies compared to non-barred ones.

Findings

Barred galaxies tend to be offset with higher velocity dispersions.

Some AGN with low sigma_0 are above the standard M_bh-sigma relation.

Core galaxies do not form a distinct subgroup in the M_bh-sigma diagram.

Abstract

An updated catalogue of 76 galaxies with direct supermassive black hole mass measurements (M_bh) plus, when available, their host bulge's central velocity dispersion (sigma_0) is provided. Fifty of these mass measurements are considered reliable, while the others remain somewhat uncertain at this time. An additional eight stellar systems, including one stellar cluster and three globular clusters, are listed as hosting potential intermediate mass black holes < 10^6 M_solar. With this larger data set, the demographics within the M_bh-sigma_0 diagram are briefly explored. Many barred galaxies are shown to be offset from the M_bh-sigma_0 relation defined by the non-barred galaxies, in the sense that their velocity dispersions are too high. Furthermore, including 88 AGN with black hole mass estimates from reverberation mapping studies, we speculate that barred AGN may follow this same general trend. We also show that some AGN with sigma_0 < 100 km/s tend to reside up to 0.6 dex above the "barless" M_bh-sigma_0 relation. Finally, it is shown that ``core galaxies'' appear not to define an additional subdivision of the M_bh-sigma_0 diagram, although improved methods for measuring sigma_0-values will be valuable.