Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21933819f&link_type=abstract
American Astronomical Society, AAS Meeting #219, #338.19
Astronomy and Astrophysics
Astronomy
Scientific paper
We use Chandra and XMM-Newton data to compare between the ROSAT brightest cluster sample compiled by Vikhlinin et. al. 2011 and the "Early Sunyaev-Zeldovich” catalog of clusters blindly identified by the Planck observatory. We take the one hundred highest flux (0.1-2.4 KeV) members of the ROSAT sample and one hundred strongest signals from the Planck catalog, as determined by the integrated compton y-parameter reported by Planck, and take a redshift cut of z < 0.3. We have examined trends in cluster morphology for these samples, using parameters described in Hudson et. al. 2009 to quantify the cool core structure of the clusters, and in our initial calculation have found that a larger proportion of the x-ray sample appears to have a cool core compared to the Planck sample. We are currently determining how, for the Planck sample, the integrated y-parameter corresponds to the x-ray luminosity and temperature, and how the signals from these two sources relate to physical cluster parameters, particularly morphology. Therefore, we will be adding Chandra results to determine scaling relations as has been previously done with XMM-Newton. We intend, ultimately, to be able to describe the physical reasons for the difference between these two samples.
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