Tracing Dark Matter Halos with Satellite Kinematics and the Central Stellar Velocity Dispersion of Galaxies

Abstract

It has been suggested that the central stellar velocity dispersion of galaxies can trace dark matter halo mass directly. We test this hypothesis using a complete spectroscopic sample of isolated galaxies surrounded by faint satellite galaxies from the Sloan Digital Sky Survey Data Release 12. We apply a friends-of-friends algorithm with projected linking length $\Delta D<100$ kpc and radial velocity linking length $\Delta V<1000$ km s${}^{-1}$ to construct our sample. Our sample includes 2807 isolated galaxies with 3417 satellite galaxies at $0.01<z<0.14$. We divide the sample into two groups based on the primary galaxy color: red and blue primary galaxies separated at $(g-r{)}_0=0.85$. The central stellar velocity dispersions of the primary galaxies are proportional to the luminosities and stellar masses of the same galaxies. Stacking the sample based on the central velocity dispersion of the primary galaxies, we derive the velocity dispersions of their satellite galaxies, which trace the dark matter halo mass of the primary galaxies. The system velocity dispersion of the satellite galaxies shows a remarkably tight correlation with the central velocity dispersion of the primary galaxies for both red and blue samples. In particular, the slope of the relation is identical to 1 for red primary systems. This tight relation suggests that the central stellar velocity dispersion of galaxies is indeed an efficient and robust tracer for dark matter halo mass. We provide empirical relations between the central stellar velocity dispersion and the dark matter halo mass.

16 pages, 15 figures, Accepted for publication in Astrophysical Journal

References in corpus (21)

• Introducing the Illustris Project: Simulating the coevolution of dark and visible matter in the Universe
• UV Star Formation Rates in the Local Universe
• Updated Nearby Galaxy Catalog
• Virial Scaling of Massive Dark Matter Halos: Why Clusters Prefer a High Normalization Cosmology
• The relation between velocity dispersion and mass in simulated clusters of galaxies: dependence on the tracer and the baryonic physics
• Brightest Cluster Galaxies at the Present Epoch
• Evolution in the Halo Masses of Isolated Galaxies between z~1 and z~0: From DEEP2 to SDSS
• The universal distribution of halo interlopers in projected phase space. Bias in galaxy cluster concentration and velocity anisotropy?
• Physical properties underlying observed kinematics of satellite galaxies
• The Scaling of Stellar Mass and Central Stellar Velocity Dispersion for Quiescent galaxies at z < 0.7
• SHELS: A Complete Galaxy Redshift Survey with R$\le$20.6
• Testing gravity with motion of satellites around galaxies: Newtonian gravity against Modified Newtonian Dynamics
• Spectrophotometry with Hectospec, the MMT's Fiber-Fed Spectrograph
• The Cluster-EAGLE project: velocity bias and the velocity dispersion - mass relation of cluster galaxies
• Massive Dark Matter Halos around Bright Isolated Galaxies in the 2dFGRS
• Dwarf Galaxies in the Local Volume
• To the Edge of M87 and Beyond: Spectroscopy of Intracluster Globular Clusters and Ultra Compact Dwarfs in the Virgo Cluster
• Biases in galaxy cluster velocity dispersion and mass estimates in the small number of galaxies regime
• Cosmic flow around local massive galaxies
• Velocity Dispersions of Massive Quiescent Galaxies from Weak Lensing and Spectroscopy
• A Universal fundamental plane and the $M_{dyn}-M_{\star }$ relation for galaxies with CALIFA and MaNGA

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