Computer Science
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50547r&link_type=abstract
Spitzer Proposal ID #50547
Computer Science
Scientific paper
X-ray underluminous clusters compose about half of the known cluster population, but their star formation is rarely studied. Their lower X-ray luminosities, compared with expectations from the scaling relation between X-ray luminosity and virial mass traced by the X-ray-selected clusters, are probably a result of the intracluster gas still being in the process of infalling and suggest they may be nascent clusters. The deficiency of the hot X-ray gas and the particular forming stage of the X-ray underluminous clusters may result in very different star formation properties when compared with well relaxed, X-ray luminous clusters. In the last Spitzer cycle, we proposed to observe four X-ray underluminous clusters with MIPS to study their star formation properties. Although we do not have MIPS data yet, the spectroscopic data we have obtained for these clusters already show evidence of surprisingly high star formation activities. However, with only four clusters in the sample, it is difficult to draw a statistically significant result. To further confirm this tentative result and to increase the statistical sample, we propose to observe four more X-ray underluminous clusters. This proposal will help us determine the mechanisms that suppress the star formation in the X-ray luminous clusters.
Bai Lianfa
Rieke George
Tyler Krystal
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