Balancing The Baryon Budget: The Fraction Of The IGM Due To Galaxy Mergers

Details Balancing The Baryon Budget: The Fraction Of The IGM Due To Galaxy Mergers Balancing The Baryon Budget: The Fraction Of The IGM Due To Galaxy Mergers

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21541029s&link_type=abstract

American Astronomical Society, AAS Meeting #215, #410.29; Bulletin of the American Astronomical Society, Vol. 42, p.239

Astronomy and Astrophysics

Astronomy

Scientific paper

Observations indicate that roughly 60% of the baryons may exist in a Warm-Hot Intergalactic Medium (WHIM) at low redshifts. Following up on previous results showing that gas is released through galaxy mergers, we use a semi-analytic technique to estimate the fraction of gas mass lost from halos solely due to mergers. We find that up to 50% of the gas in a halo unbinds over the course of galaxy assembly. This process does not act preferentially on smaller mass halos; bigger halos always release larger amounts of gas in a given volume of the Universe. Overall, we find that about half of the WHIM can be generated by gas released during galaxy mergers.

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