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The Halo by Halo Missing Baryon Problem

Published online by Cambridge University Press:  01 June 2007

Stacy S. McGaugh
Stacy S. McGaugh*
Affiliation:
Department of Astronomy, University of Maryland, College Park, MD 20742, USA email: [email protected]
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Abstract

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The global missing baryon problem – that the sum of observed baryons falls short of the number expected form BBN – is well known. In addition to this, there is also a local missing baryon problem that applies to individual dark matter halos. This halo by halo missing baryon problem is such that the observed mass fraction of baryons in individual galaxies falls short of the cosmic baryon fraction. This deficit is a strong function of circular velocity. I give an empirical estimate of this function, and note the presence of a critical scale of ~ 900 km s−1 therein. I also briefly review Ωb from BBN, highlighting the persistent tension between lithium and the CMB, and discuss some pros and cons of individual galaxies and clusters of galaxies as potential reservoirs of dark baryons.

Keywords

galaxies: formationgalaxies: fundamental parametersgalaxies: clustersdark mattercosmic microwave backgroundcosmological parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 136 - 145
Copyright
Copyright © International Astronomical Union 2008

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