The halo by halo missing baryon problem

Details The halo by halo missing baryon problem The halo by halo missing baryon problem

2007-07-25

arxiv.org/abs/0707.3795v1

Astronomy and Astrophysics

Astrophysics

10 pages, review for IAU Symposium 244, Dark Galaxies & Lost Baryons

Scientific paper

10.1017/S1743921307013920

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 therein. I also briefly review Omega_b 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.

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