Cosmic Voids in Sloan Digital Sky Survey Data Release 7
  We study the distribution of cosmic voids and void galaxies using Sloan
Digital Sky Survey Data Release 7 (SDSS DR7). Using the VoidFinder algorithm as
described by Hoyle 2002, 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%. 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 \delta <
-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 8,046 galaxies brighter than M_r = -20.09 within the voids,
accounting for 7% of the galaxies. We compare the results of VoidFinder on SDSS
DR7 to mock catalogs generated from a SPH halo model simulation as well as
other \Lambda -CDM simulations and find similar void fractions and void sizes
in the data and simulations. This catalog is made publicly available at
http://www.physics.drexel.edu/~pan/voidcatalog.html for download.
