The Luminosity Function of Void Galaxies in the Sloan Digital Sky Survey

Details The Luminosity Function of Void Galaxies in the Sloan Digital Sky Survey The Luminosity Function of Void Galaxies in the Sloan Digital Sky Survey

2003-09-26

arxiv.org/abs/astro-ph/0309728v1

Astrophys.J.620:618-628,2005

Astronomy and Astrophysics

Astrophysics

Submitted to ApJ

Scientific paper

10.1086/427176

(Abridged) The Sloan Digital Sky Survey now extends over a large enough region that galaxies in low density environments can be detected. Rojas et al. have developed a technique to extract more than 1000 void galaxies with delta rho/rho < -0.6 on scales r>7 h^{-1} Mpc from the SDSS. In this paper, we present the luminosity function of these galaxies and compare it to that of galaxies at higher densities. We obtain a measurement of the void galaxy luminosity function over the range -21.55A wall galaxies is very similar in shape to that of the void galaxies, with only slightly brighter M_r* values and similar values of alpha. The value of alpha ~ -1.2 found from the void galaxy LF is shallower that that found from CDM models, suggesting that voids are not filled with a large population of dwarf galaxies.

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