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Voids in the Local Volume: a Limit on Appearance of a Galaxy in a Dark Matter Halo

Published online by Cambridge University Press:  01 June 2007

Anton V. Tikhonov  and
Anatoly A. Klypin
Anton V. Tikhonov
Affiliation:
Chair of Astrophysics, Department of Mathematics and Mechanics, St. Petersburg State University, Universitetsky prospect, 28, Saint-Petersburg, Petrodvoretz, 198504Russian Federation email: ti@hotbox.ru, avt@gtn.ru
Anatoly A. Klypin
Affiliation:
The Astronomy Department, New Mexico State University, Las Cruces, New Mexico 88003-8001, USA email: aklypin@nmsu.edu
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Abstract

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Current explanation of the overabundance of dark matter subhalos in the Local Group (LG) indicates that there maybe a limit on mass of a halo, which can host a galaxy. This idea can be tested using voids in the distribution of galaxies: at some level small voids should not contain any (even dwarf) galaxies. We use observational samples complete to MB = −12 with distances less than 8 Mpc to construct the void function (VF): the distribution of sizes of voids empty of any galaxies. There are ~ 30 voids with sizes ranging from 1 to 5 Mpc. We then study the distribution of dark matter halos in very high resolution simulations of the LCDM model. The theoretical VF matches the observations remarkably well only if we use halos with circular velocities larger than 45 ± 10 km/s. This agrees with the Local Group predictions. There are smaller halos in the voids, but they should not produce any luminous matter. Small voids look quite similar to their giant cousins: the density has a minimum at the center of a void and it increases as we get closer to the border. Small nonluminous halos inside the void form a web of tiny filaments. Thus, both the Local Group data and the nearby voids indicate that isolated halos below 45 ± 10 km/s must not host galaxies and that small (few Mpc) voids are truly dark.

Keywords

galaxies: structurestatisticshaloscosmology: large-scale structure of universedark matter
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 152 - 156
Copyright
Copyright © International Astronomical Union 2008

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