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The Mass Function of Void Galaxies in the SDSS Data Release 2 | | David M. Goldberg
; Timothy D. Jones
; Fiona Hoyle
; Randall R. Rojas
; Michael S. Vogeley
; Michael R. Blanton
; | | Date: |
23 Jun 2004 | | Journal: | Astrophys.J. 621 (2005) 643-650 | | Subject: | astro-ph | | Affiliation: | Drexel), Timothy D. Jones (Drexel), Fiona Hoyle (Drexel), Randall R. Rojas (Drexel), Michael S. Vogeley (Drexel), and Michael R. Blanton (NYU | | Abstract: | 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. | | Source: | arXiv, astro-ph/0406527 | | Services: | Forum | Review | PDF | Favorites | |
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