Shapes of Voids in the SDSS

Details Shapes of Voids in the SDSS Shapes of Voids in the SDSS

Jan 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342507p&link_type=abstract

American Astronomical Society, AAS Meeting #213, #425.07; Bulletin of the American Astronomical Society, Vol. 41, p.253

Astronomy and Astrophysics

Astronomy

Scientific paper

Voids in the Universe are believed to evolve spherically in shape as predicted by linear gravitation theory (Icke 1984). Voids in redshift space can have different shapes from voids in real space either due to nonlinear redshift space distortions along the line of sight, or linear infall onto structures. These effects cause asphericity in the voids. To measure this effect, we compute the ellipticity of voids from the sample of 1000 voids in the SDSS DR7 void catalog (Pan et al. in prep). For each void, we determine the best-fit ellipsoid for the volume. We calculate the line of sight projections of the major axes and determine possible effects of redshift distortions by comparing to effects in a Lambda-CDM simulation. We find that voids occupy roughly 50% of the Universe, and tend to be prolate in shape as opposed to oblate. We also find that redshift distortions expand the volume of the voids uniformly.

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