Missing Baryon Problem(s)

This (http://arxiv.org/abs/1003.3273) paper talks about two missing baryon problems: one, the global one, that most of the baryons (accounting for all observed sources, stars, cool gas, ICM, Ly alpha forest, etc.) in the universe as a whole are missing. The second missing baryon problem is that most galaxies (like our own) are severely baryon poor. Numerical simulations suggest that rest of the baryons are in the difficult to observe warm hot intergalactic medium (WHIM). This paper argues, based on observation of pulsar dispersion measure, OVII absorption, etc., that most of the baryons are not in the Galactic halo. Moreover, from the lack of correlation between AGN/stellar feedback indicators (e.g., stellar fraction, bulge mass) and the missing baryon fraction from a galaxy, these authors argue that the baryons are not missing because of outflows driven by feedback. Rather the baryons never fell into the dark matter halos in the first place!