Photometric Properties of Void Galaxies in the Sloan Digital Sky Survey

By Randall R. Rojas, Michael S. E. Vogeley, F. Hoyle, J. Brinkmann. 2003

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Using a nearest neighbor analysis, we construct a sample of void galaxies from the Sloan Digital Sky Survey (SDSS) and compare the photometric properties of these galaxies to the population of nonvoid (wall) galaxies. We trace the density field of galaxies using a volume-limited sample with zmax = 0.089. Galaxies from the flux-limited SDSS with z ≤ zmax and fewer than three volume-limited neighbors within 7 h-1 Mpc are classified as void galaxies. This criterion implies a density contrast δρ/ρ < -0.6 around void galaxies. From 155,000 galaxies, we obtain a subsample of 13,742 galaxies with z ≤ zmax, from which we identify 1010 galaxies as void galaxies. To identify an additional 194 faint void galaxies from the SDSS in the nearby universe, r ≲ 72 h-1 Mpc, we employ volume-limited samples extracted from the Updated Zwicky Catalog and the Southern Sky Redshift Survey with zmax = 0.025 to trace the galaxy distribution. Our void galaxies span a range of absolute magnitude from Mr = -13.5 to -22.5. Using SDSS photometry, we compare the colors, concentration indices, and Sersic indices of the void and wall samples. Void galaxies are significantly bluer than galaxies lying at higher density. The population of void galaxies with Mr ≲ M* + 1 and brighter is on average bluer and more concentrated (later type) than galaxies outside of voids. The latter behavior is only partly explained by the paucity of luminous red galaxies in voids. These results generally agree with the predictions of semianalytic models for galaxy formation in cold dark matter models, which indicate that void galaxies should be relatively bluer, more disklike, and have higher specific star formation rates.

Subfields: Astronomy and Astrophysics, Ecology, Instrumentation

View Paper: https://www.semanticscholar.org/paper/504cde270bdc54a2059ed383362e9bb43f65f5a4

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Citations in the corpus

Environmental Dependence of Properties of Galaxies in the Sloan Digital Sky Survey (2006, background): “…been made to accurately measure the environmental effects on various physical properties of galaxies (Goto et al. 2003; Balogh et al. 2004a, 2004b; Rojas et al. 2004, 2005; Hoyle et al. 2005; Blanton et al. 2005a; Croton et al. 2005; Tanaka et al. 2004; Weinmann et al. 2006; Boselli & Gavazzi…”
The Aspen-Amsterdam void finder comparison project (2008, unknown): “…Sky Survey (SDSS, York et al. 2000) see Hoyle & Vogeley (2004), Ceccarelli et al. (2006), Patiri et al. (2006a), Tikhonov (2006), von Benda-Beckmann & Müller (2008) and Rojas et al. (2004), Goldberg et al. (2005), Hoyle et al. (2005), Rojas et al. (2005), Patiri et al. (2006b), respectively.”
Galaxy Zoo: the dependence of morphology and colour on environment (2008, background): “Studies of galaxies in void environments have previously found colour, and star formation, to vary with local galaxy density (Rojas et al. 2004, 2005; Ceccarelli et al. 2008).”
Cosmic Voids in Sloan Digital Sky Survey Data Release 7 (2011, background): “…to a picture in which star formation in void halos is suppressed, our analyses of void galaxies in the SDSS DR2 and DR4 samples indicate that void galaxies are bluer and have higher specific star formation rates than galaxies in denser environments (Rojas et al. 2004, 2005; Park et al. 2007).”