Average Baryon Fractions for 4000 2MASS Groups and Clusters

Details Average Baryon Fractions for 4000 2MASS Groups and Clusters Average Baryon Fractions for 4000 2MASS Groups and Clusters

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.3419d&link_type=abstract

American Astronomical Society, HEAD meeting #11, #34.19; Bulletin of the American Astronomical Society, Vol. 41, p.713

Astronomy and Astrophysics

Astronomy

Scientific paper

We present measurements of baryon fractions of 2MASS groups and clusters out to r200. We find a break in the baryon fraction at 1keV, and significantly smaller baryon fractions below this temperature, and the baryon fraction of poor groups joins smoothly onto that of systems with still shallower potential wells such as normal and dwarf galaxies. The small scatter in the baryon fraction as any given potential well depth favors a universal baryon loss mechanism and a preheating model for the baryon loss. The scatter is, however, larger for less massive systems.

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