publication . Article . Other literature type . Preprint . 2018

Stellar Velocity Dispersion: Linking Quiescent Galaxies to their Dark Matter Halos

Zahid, H. Jabran; Sohn, Jubee; Geller, Margaret J.;
Open Access
  • Published: 29 May 2018 Journal: The Astrophysical Journal, volume 859, page 96 (eissn: 1538-4357, Copyright policy)
  • Publisher: American Astronomical Society
Abstract
We analyze the Illustris-1 hydrodynamical cosmological simulation to explore the stellar velocity dispersion of quiescent galaxies as an observational probe of dark matter halo velocity dispersion and mass. Stellar velocity dispersion is proportional to dark matter halo velocity dispersion for both central and satellite galaxies. The dark matter halos of central galaxies are in virial equilibrium and thus the stellar velocity dispersion is also proportional to dark matter halo mass. This proportionality holds even when a line-of-sight aperture dispersion is calculated in analogy to observations. In contrast, at a given stellar velocity dispersion, the dark matte...
Subjects
arXiv: Astrophysics::Cosmology and Extragalactic AstrophysicsAstrophysics::Galaxy AstrophysicsAstrophysics::Solar and Stellar Astrophysics
free text keywords: Space and Planetary Science, Astronomy and Astrophysics, Astrophysics - Astrophysics of Galaxies, Halo, Dispersion (optics), Velocity dispersion, Galaxy, Satellite galaxy, Dark matter halo, Astrophysics, Virial theorem, Dark matter, Physics
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