The Baryons Content of the Most Massive Spiral Galaxy

Details The Baryons Content of the Most Massive Spiral Galaxy The Baryons Content of the Most Massive Spiral Galaxy

Sep 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008cxo..prop.2675b&link_type=abstract

Chandra proposal ID #10610527

Mathematics

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Scientific paper

Galaxies are missing most of their baryons when compared to the cosmological baryon to dark matter ratio. The Milky Way is missing at least 70% of its baryons while lower mass galaxies retain 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 gas. We propose to test this picture by searching for the missing baryons surrounding the very massive spiral galaxy, NGC 1961, which has 9 times the stellar content of M31 and with v_rot = 450 km/sec. If successful, we will measure the location and amount of its missing baryons.

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