The Mass Function of Void Galaxies in the SDSS Data Release 2

Details The Mass Function of Void Galaxies in the SDSS Data Release 2 The Mass Function of Void Galaxies in the SDSS Data Release 2

2004-06-23

arxiv.org/abs/astro-ph/0406527v2

Astrophys.J. 621 (2005) 643-650

Astronomy and Astrophysics

Astrophysics

9 pages, 5 postscript figures. Accepted to Astrophysical Journal; Revisions in response to referee comments

Scientific paper

10.1086/427679

We estimate the Mass Function of void galaxies in the second public data release of the Sloan Digital Sky Survey from a sample of 1000 galaxies with local density contrasts of delta_v < -0.6. The galaxy sample is split into ellipticals and spirals using a color-Sersic index criteria. We estimate the virial masses of ellipticals using the measured spectral line-widths along with the observed size. Projection effects and uncertainties in halo properties make mass estimates of spirals more difficult. We use an inversion of the Tully-Fisher relation to estimate the isothermal rotational velocity, and introduce a scaling factor to estimate the halo extent. We then fit the measured mass function against a theoretical Press-Schechter model, and find that the distribution of galaxies in voids appears to be nearly unbiased compared to the mass.

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