Mathematics – Logic
Scientific paper
Jan 2010
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21560224y&link_type=abstract
American Astronomical Society, AAS Meeting #215, #602.24; Bulletin of the American Astronomical Society, Vol. 36, p.1125
Mathematics
Logic
Scientific paper
Clusters of galaxies are invaluable cosmological probes, but systematic biases and the form and evolution of scatter in the mass-observable relations need to be understood to obtain accurate mass estimates. We use N-body plus hydrodynamic simulations including different physical processes to study the impact of halo concentration, dynamical state, and AGN feedback on scatter in the X-ray temperature-mass and the SZ flux-mass scaling relations. We find that the variation in concentration is a significant source of scatter in both relations. Contrary to intuition, the effect of dynamical state is negligible. The feedback from the supermassive black holes can introduce large variations in cluster observables, but model and parameter dependence still need to be quantified. The implications of our results for cluster cosmology are discussed.
Bhattacharya Sailajananda
Ricker Paul
Sutter Paul
Yang Hsiang-Yi
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