SIMBAD references

2019MNRAS.489.3797M - Mon. Not. R. Astron. Soc., 489, 3797-3809 (2019/November-1)

The stellar velocity dispersion in nearby spirals: radial profiles and correlations.


Abstract (from CDS):

The stellar velocity dispersion, σ, is a quantity of crucial importance for spiral galaxies, where it enters fundamental dynamical processes such as gravitational instability and disc heating. Here we analyse a sample of 34 nearby spirals from the Calar Alto Legacy Integral Field Area (CALIFA) spectroscopic survey, deproject the line-of-sight σ to σR, and present reliable radial profiles of σR as well as accurate measurements of <σR> , the radial average of σR over one effective (half-light) radius. We show that there is a trend for σR to increase with decreasing R, that <σR> correlates with stellar mass (M*), and tested correlations with other galaxy properties. The most significant and strongest correlation is the one with M*: <σR>∝M*0.5. This tight scaling relation is applicable to spiral galaxies of type Sa-Sd and stellar mass M* ≃ 109.5-1011.5 M. Simple models that relate σR to the stellar surface density and disc scale length roughly reproduce that scaling, but overestimate <σR> significantly.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): instabilities - ISM: kinematics and dynamics - galaxies: ISM - galaxies: kinematics and dynamics - galaxies: star formation - galaxies: structure

Simbad objects: 35

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