Most of the Baryons in Galaxies

Details Most of the Baryons in Galaxies Most of the Baryons in Galaxies

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007xmm..prop..114b&link_type=abstract

XMM-Newton Proposal ID #05538701

Mathematics

Logic

Galaxies, Galactic Surveys, Ugc12591, Xmm-Newton Proposal Id #05538701

Scientific paper

Galaxies are missing most of their baryons when compared to the cosmological baryon to dark matter ratio. The Milky Way is missing 2/3 of its baryons and less massive galaxies have retained less than 10% of their baryons. Theory suggests that these baryons were expelled by intense galactic winds during the primary star formation period. These galactic winds carry gas far beyond the virial radius of small and modest galaxies, but the most massive galaxies should retain much of this material. e propose to test this picture by searching for the missing baryons surrounding the most massive spiral galaxy, UGC 12591, a fairly isolated galaxy with a rotational velocity of almost 500 km/sec. If successful, we will detect a significant fraction of the 5E11 Msun of its missing baryons.

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