Physics
Scientific paper
Apr 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003assl..281..321h&link_type=abstract
The IGM/Galaxy Connection: The Distribution of Baryons at z=0, ASSL Conference Proceedings Vol. 281. Edited by Jessica L. Rosenb
Physics
Scientific paper
Using the ACIS-I detector on the Chandra X-ray Observatory, we observed two spiral galaxies, NGC 4911 and NGC 4921, falling into the Coma cluster of galaxies. NGC 4911 has only a small mass of hot interstellar medium, with ~90% of the X-ray emission coming from an active galactic nucleus. We find two point sources with the spectral properties of high mass X-ray binaries, indicating a small amount of star formation. NGC 4921, slightly farther from the cluster center, still has a hot interstellar medium, but shows a similar low rate of star formation based on H-alpha emission. For both cases, the H-alpha emission is located in a narrow ring, near the boundary of the remaining hot interstellar medium and the cluster's intracluster medium. Recent theoretical work shows that these physical radii are the only places in the disk of the galaxy dynamically cool enough to form stars and, therefore, the star formation could be from the accretion of cooler gas from galaxies' halos. As the remaining gas from each galaxy is stripped off and star formation ends, both are likely to evolve into spheroidal or S0 galaxies in a few giga-years.
Gregg Michael
Holden Bradford
West Michael
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