Unveiling the Most Massive Clusters at z>0.5 with Planck and XMM-Newton
Abstract
With this proposal, we request support for an approved XMM-Newton AO-11 (PI M. Arnaud, Co-I of this proposal) Large Programs that aim to study the physical properties of a sample of 33 massive (M_500>5 10e14 solar mass) clusters of galaxies blindly detected by Planck and confirmed to-day to be in the redshift range 0.5<z<1. Using for the first time a statistically significant sample in this high-mass, high-redshift regime, we will study the fundamental scalings between YSZ, YX, and M500, and the pressure and entropy profiles. To reach this purpose we requested the observation of 25 systems that, to date, did not have sufficient X-ray exposure or no X-ray data at all. The XMM Newton Observing Time Allocation Committee awarded us to observe all the proposed targets for a total exposure time of 595 ks. Based on other work carried out as part of Planck catalog validation, we know that all the clusters in the sample are hot (kT >5keV), high mass objects with complex morphologies and density profiles far shallower than those of X-ray-selected cluster samples in the same mass range. Our study will help addressing fundamental questions in the field like the structure formation in the Universe and the physics of the intracluster medium. In particular, we will be able to constraining, for the first time, the SZ-X-ray-Optical scaling relations of a unique and statistically significant sample of cluster of galaxies in the high mass high z (0.5<z<1) regime. Beside being an important probe of the physics of the gas gravitational collapse, we will also precisely quantify how new SZ-selected clusters differ from X-ray selected clusters so that we can better assess the implication on the use of the clusters of galaxies as tools for precise cosmology studies. Furthermore, it will be of large legacy value for the cosmological exploitation of the full Planck cluster sample that will be made available to the scientific community in the next few years.
- Publication:
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NASA ADAP Proposal
- Pub Date:
- 2012
- Bibcode:
- 2012adap.prop..131M