Large Halos of Missing Baryons Around Galaxies

Details Large Halos of Missing Baryons Around Galaxies Large Halos of Missing Baryons Around Galaxies

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop..118b&link_type=abstract

XMM-Newton Proposal ID #06532902

Mathematics

Logic

Galaxies, Galactic Surveys, Cig 1 North, Cig 1 South

Scientific paper

If galaxies had the cosmological baryon-to-dark matter ratio, they would have 3-30 times their observed baryon mass. These missing baryons are undetected, but some fraction may surround a galaxy with a hot diffuse halo extending to R_virial (250 kpc). A loosely bound gaseous halo could be stripped in a cluster or group environment, but should be relatively undisturbed around isolated late-type spirals. Existing observations of spirals are mainly of nearby systems, where only the inner parts fit in a field of view so a halo on the scale of R_virial would pass unnoticed. To detect or place limits on a large halo of missing baryons, we propose to observe isolated L* spirals sufficiently distant that we can detect emission to at least R_virial.

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