Journal Article

Cosmic voids in Sloan Digital Sky Survey Data Release 7

Danny C. Pan, Michael S. Vogeley, Fiona Hoyle, Yun-Young Choi and Changbom Park

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 421, issue 2, pages 926-934
Published in print April 2012 | ISSN: 0035-8711
Published online March 2012 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2011.20197.x
Cosmic voids in Sloan Digital Sky Survey Data Release 7

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We study the distribution of cosmic voids and void galaxies using Sloan Digital Sky Survey Data Release 7 (SDSS DR7). Using the VoidFinder algorithm based on the original VoidFinder method devised by El-Ad & Piran and implemented by Hoyle & Vogeley, we identify 1054 statistically significant voids in the Northern galactic hemisphere with radii > 10 h−1 Mpc. The filling factor of voids in the sample volume is 62 per cent. The largest void is just over 30 h−1 Mpc in effective radius. The median effective radius is 17 h−1 Mpc. The voids are found to be significantly underdense, with density contrast δ < − 0.85 at the edges of the voids. The radial-density profiles of these voids are similar to predictions of dynamically distinct underdensities in gravitational theory. We find 8046 galaxies brighter than Mr=− 20.09 within the voids, accounting for 7 per cent of the galaxies. We compare the results of VoidFinder on SDSS DR7 to mock catalogues generated from a smoothed particle hydrodynamics (SPH) halo model simulation as well as other Λ cold dark matter (ΛCDM) simulations and find similar void fractions and void sizes in the data and simulations. This catalogue is made publicly available at http://www.physics.drexel.edu/~pan/VoidCatalog for download.

Keywords: catalogues; large-scale structure of Universe

Journal Article.  6580 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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