SIMBAD references

2014MNRAS.437.3670C - Mon. Not. R. Astron. Soc., 437, 3670-3687 (2014/February-1)

Modelling mass distribution in elliptical galaxies: mass profiles and their correlation with velocity dispersion profiles.


Abstract (from CDS):

We assemble a statistical set of global mass models for ∼ 2000 nearly spherical Sloan Digital Sky Survey (SDSS) galaxies at a mean redshift of <z> = 0.12 based on their aperture velocity dispersions and newly derived luminosity profiles in conjunction with published velocity dispersion profiles and empirical properties and relations of galaxy and halo parameters. When two-component (i.e. stellar plus dark) mass models are fitted to the SDSS aperture velocity dispersions, the predicted velocity dispersion profile (VP) slopes within the effective (i.e. projected half-light) radius Reff match well the distribution in observed elliptical galaxies. From a number of input variations the models exhibit for the radial range 0.1Reff < r < Reff a tight correlation <γe> = (1.865±0.008) + (-4.93±0.15)<η> where <γe> is the mean slope absolute value of the total mass density and <η> is the mean slope of the velocity dispersion profile, which leads to a super-isothermal <γe> = 2.15±0.04 for <η> = -0.058±0.008 in observed elliptical galaxies. Furthermore, the successful two-component models appear to imply a typical slope curvature pattern in the total mass profile because for the observed steep luminosity (stellar mass) profile and the weak lensing inferred halo profile at large radii a total mass profile with monotonically varying slope would require too high dark matter density in the optical region giving rise to too large aperture velocity dispersion and too shallow VP.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: formation - galaxies: haloes - galaxies: kinematics and dynamics - galaxies: structure - dark matter

Simbad objects: 6

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