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2019ApJ...877...64D - Astrophys. J., 877, 64-64 (2019/May-3)

A consistent set of empirical scaling relations for spiral galaxies: the (vmax, MoM)-(σ0, MBH, φ) relations.


Abstract (from CDS):

Using the latest sample of 48 spiral galaxies having a directly measured supermassive black hole mass, MBH, we determine how the maximum disk rotational velocity, vmax (and the implied dark matter halo mass, MDM), correlates with the (i) black hole mass, (ii) central velocity dispersion, σ0, and (iii) spiral-arm pitch angle, ph. We find that MBH∝v{max}^10.62±1.37^∝MDM^4.35±0.66^, significantly steeper than previously reported, and with a total root mean square scatter (0.58 dex) similar to that about the MBH0 relation for spiral galaxies-in stark disagreement with claims that MBH does not correlate with disks. Moreover, this MBH-vmax relation is consistent with the unification of the Tully-Fisher relation (involving the total stellar mass, M*,tot) and the steep MBH∝M_* ,tot_^3.05±0.53^ relation observed in spiral galaxies. We also find that σ0∝v{max}^1.55±0.25^∝MDM^0.63±0.11^, consistent with past studies connecting stellar bulges (with σ0 >= 100 km s–1), dark matter halos, and a nonconstant vmax0 ratio. Finally, we report that tan| φ| ∝(-1.18±0.19)logv{max}∝(-0.48±0.09)logMDM, providing a novel formulation between the geometry (i.e., the logarithmic spiral-arm pitch angle) and kinematics of spiral galaxy disks. While the vmax-ph relation may facilitate distance estimations to face-on spiral galaxies through the Tully-Fisher relation and using ph as a proxy for vmax, the MDM-ph relation provides a path for determining dark matter halo masses from imaging data alone. Furthermore, based on a spiral galaxy sample size that is double the size used previously, the self-consistent relations presented here provide dramatically revised constraints for theory and simulations.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

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

Simbad objects: 54

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