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Title:
An Entropy Threshold for Strong Hα and Radio Emission in the Cores of Galaxy Clusters
Authors:
Cavagnolo, Kenneth W.; Donahue, Megan; Voit, G. Mark; Sun, Ming
Affiliation:
AA(Michigan State University, Department of Physics and Astronomy, East Lansing, MI 48824; ), AB(Michigan State University, Department of Physics and Astronomy, East Lansing, MI 48824; ), AC(Michigan State University, Department of Physics and Astronomy, East Lansing, MI 48824; ), AD(Michigan State University, Department of Physics and Astronomy, East Lansing, MI 48824; )
Publication:
The Astrophysical Journal, Volume 683, Issue 2, pp. L107-L110. (ApJL Homepage)
Publication Date:
08/2008
Origin:
UCP
ApJ Keywords:
Conduction, Galaxies: Cooling Flows, Galaxies: Active, Galaxies: Clusters: General, Galaxies: Evolution, X-Rays: Galaxies: Clusters
DOI:
10.1086/591665
Bibliographic Code:
2008ApJ...683L.107C

Abstract

Our Chandra X-Ray Observatory archival study of intracluster entropy in a sample of 222 galaxy clusters shows that Hα and radio emission from the brightest cluster galaxy are much more pronounced when the cluster's core gas entropy is <~30 keV cm2. The prevalence of Hα 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.
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