Chandra Studies of Dark Matter and Galaxy Formation: Signatures from the Intracluster Medium

Details Chandra Studies of Dark Matter and Galaxy Formation: Signatures from the Intracluster Medium Chandra Studies of Dark Matter and Galaxy Formation: Signatures from the Intracluster Medium

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.7711d&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #77.11; Bulletin of the American Astronomical Society, V

Astronomy and Astrophysics

Astrophysics

Scientific paper

We present two on-going Chandra studies of X-ray clusters of galaxies. Our first study is a deep, 200 ksec observation of the nearby cluster Abell 1650. Abell 1650 has a very faint radio source and no obvious cavities, yet early observations by Chandra revealed an elevated entropy level in the gas in the core. Follow-up observations of this cluster have allowed us to extract a detailed temperature, mass, and entropy profile, as well as a map of metallicity variations in the core. Our second study is an archival review of the entropy profiles of nearly all of the clusters in the current Chandra archive, significantly extending our work from Donahue et al. (2006). We find that the cores of clusters have a range of central entropies (not bi-modal), including clusters with extremely low central entropy ( 2 keV cm-2) and isothermal clusters with high central entropy. We discuss the radio and emission-line properties of the central galaxies in context with the central entropy levels of the host cluster. This work has been supported by a NASA Long Term Space Astrophysics grant and by the SAO/Chandra Science Center.

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