Probing Structure Formation Physics with the Evolution of Galaxy Cluster Properties

Details Probing Structure Formation Physics with the Evolution of Galaxy Cluster Properties Probing Structure Formation Physics with the Evolution of Galaxy Cluster Properties

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20918006b&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #180.06; Bulletin of the American Astronomical Society,

Physics

Scientific paper

XMM-Newton and Chandra observations show that the dark-matter profile of local galaxy clusters is universal, with a central cusp, as predicted by numerical simulations. In contrast, the physics governing the baryonic component remains far from being understood: the gas properties of local clusters do scale self-similarly down to low masses (around 2 keV), but the scaling laws differ from the simplest expectations. It appears that the gas history depends not only on gravitational effects but also on the interplay between cooling and various galaxy feedback mechanisms, none of which are well understood.
Recent evolution studies confirm that clusters follow scaling laws up to high redshifts, but the amount of evolution remains uncertain. We were awarded a XMM-Newton Large Programme in AO4 to assess the evolution of the structural and scaling properties of an unbiased sample of 23 clusters at a redshift of 0.5, covering a large mass range (2.5 to 12 keV). In this contribution we describe the initial results of the full sample and compare the cluster properties to local samples.
We acknowledge support from NASA grant NNG0-5GL94G and NASA Contract NAS8-39073.

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