CMB as a possible new tool to study the dark baryons in galaxies

Details CMB as a possible new tool to study the dark baryons in galaxies CMB as a possible new tool to study the dark baryons in galaxies

2012-02-14

arxiv.org/abs/1202.2969v1

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

8 pages, presented at the III Italian-Pakistani Workshop on Relativistic Astrophysics, Lecce, June 20-22, 2011; to be publishe

Scientific paper

Baryons constitute about 4% of our universe, but most of them are missing and we do not know where and in what form they are hidden. This constitute the so-called missing baryon problem. A possibility is that part of these baryons are hidden in galactic halos. We show how the 7-year data obtained by the WMAP satellite may be used to trace the halo of the nearby giant spiral galaxy M31. We detect a temperature asymmetry in the M31 halo along the rotation direction up to about 120 kpc. This could be the first detection of a galactic halo in microwaves and may open a new way to probe hidden baryons in these relatively less studied galactic objects using high accuracy CMB measurements.

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