BASS. XXVI. DR2 stellar velocity dispersions

The survey represents a significant advance with a nearly complete census of velocity dispersions of hard X-ray-selected obscured AGN with measurements for 99% of nearby AGN (z<0.1) outside the Galactic plane (|b|>10{deg}). The BASS AGN have much higher velocity dispersions than the more numerous optically selected narrow-line AGN (i.e., ~150 versus ~100km/s) but are not biased toward the highest velocity dispersions of massive ellipticals (i.e., >250km/s).

Despite sufficient spectral resolution to resolve the velocity dispersions associated with the bulges of small black holes (~10^4-5^M_{sun}_), we do not find a significant population of super-Eddington AGN. Using estimates of the black hole sphere of influence from velocity dispersion, direct stellar and gas black hole mass measurements could be obtained with existing facilities for more than ~100 BASS AGN.