CfA Colloquium Schedule Spring 2013
 
 21 February 2013

21 February 2013

Speaker: Michael McDonald (MIT)

Title:The Phoenix Cluster: A New Lease on Life for Cooling Flows (and other exciting results from the South Pole Telescope)

Abstract:The "Phoenix Cluster", recently discovered by the South Pole Telescope, is remarkable for a variety of reasons - the least of which is its record-setting X-ray luminosity and total mass. In the inner ~100 kpc of this cluster, the intracluster medium is cooling at an unmatched rate, resulting in the strongest cool core on record. Unlike its low-redshift counterparts, where cooling is offset by some mysterious form of feedback, the Phoenix Cluster appears to harbor a starburst (800 Msun/yr) in the center of the cluster, roughly consistent with early cooling flow predictions. We present a variety of data for this cluster, from both space- and ground-based observatories in the X-ray through the radio, in order to paint a complete picture of this exotic system. Given the extreme star formation, which appears to be fueled by the cooling flow, we speculate that this may be a short-lived phase that a large fraction of galaxy clusters go through before feedback prevents further cooling. Other exciting, upcoming results from the South Pole Telescope collaboration will be highlighted, including a recently-completed X-ray survey of the 80 most massive galaxy clusters in the SPT 2500 square degree survey.

Video of the Presentation (Talks can be viewed with RealPlayer. Free download is available from www.real.com )

 
 

Section Photo