Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011head...12.3909m&link_type=abstract
American Astronomical Society, HEAD meeting #12, #39.09
Astronomy and Astrophysics
Astronomy
Scientific paper
The outskirts of galaxy clusters, beyond R500, remain relatively unexplored territory and yet are vital to our understanding of cluster growth, structure, and mass. We present the first results from a program to constrain the state of the outer intra-cluster medium (ICM) in a large sample of galaxy clusters, exploiting the strengths of three complementary X-ray observatories: Suzaku (low background), XMM-Newton (high sensitivity), and Chandra (good spatial resolution). By carefully combining observations from the cluster core to beyond R200, we are able to identify and reduce systematic uncertainties that would impede our spatial and spectral analysis using a single telescope. Our initial sample comprises six clusters fully covered in azimuth to beyond R200, and our analysis indicate that the ICM is not in hydrostatic equilibrium in the cluster outskirts, where we see clear azimuthal variations in temperature and surface brightness. We also describe plans to triple the size of our cluster sample, an improvement that will allow us to probe clusters exhibiting both falling and flat temperatures profiles.
Bautz Marshall
Davis Damek
George Jacob
Henry Jean
Miller Eric D.
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