Astronomy and Astrophysics – Astrophysics
Scientific paper
2008-06-02
Astronomy and Astrophysics
Astrophysics
Submitted to ApJ Letters
Scientific paper
10.1086/591665
Our Chandra X-ray Observatory archival study of intracluster entropy in a sample of 222 galaxy clusters shows that H-alpha and radio emission from the brightest cluster galaxy are much more pronounced when the cluster's core gas entropy is < 30 keV cm^2. The prevalence of H-alpha emission below this threshold indicates that it marks a dichotomy between clusters that can harbor multiphase gas and star formation in their cores and those that cannot. The fact that strong central radio emission also appears below this boundary suggests that AGN feedback turns on when the intracluster medium starts to condense, strengthening the case for AGN feedback as the mechanism that limits star formation in the Universe's most luminous galaxies.
Cavagnolo Kenneth W.
Donahue Megan
Sun Ming
Voit Gerard Mark
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