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2017ApJ...845...73S - Astrophys. J., 845, 73-73 (2017/August-2)

The velocity dispersion function for quiescent galaxies in the Local Universe.


Abstract (from CDS):

We investigate the distribution of central velocity dispersions for quiescent galaxies in the SDSS at 0.03 <= z <= 0.10. To construct the field velocity dispersion function (VDF), we construct a velocity dispersion complete sample of quiescent galaxies with Dn4000 > 1.5. The sample consists of galaxies with central velocity dispersion larger than the velocity dispersion completeness limit of the SDSS survey. Our VDF measurement is consistent with previous field VDFs for σ > 200 km s–1. In contrast with previous results, the VDF does not decline significantly for σ < 200 km s–1. The field and the similarly constructed cluster VDFs are remarkably flat at low velocity dispersion (σ < 250 km s–1). The cluster VDF exceeds the field for σ > 250 km s–1 providing a measure of the relatively larger number of massive subhalos in clusters. The VDF is a probe of the dark matter halo distribution because the measured central velocity dispersion may be directly proportional to the dark matter velocity dispersion. Thus the VDF provides a potentially powerful test of simulations for models of structure formation.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: elliptical and lenticular, cD - galaxies: fundamental parameters - galaxies: luminosity function, mass function - galaxies: luminosity function, mass function

Simbad objects: 3

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