Mathematics – Logic
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21831903r&link_type=abstract
American Astronomical Society, AAS Meeting #218, #319.03; Bulletin of the American Astronomical Society, Vol. 43, 2011
Mathematics
Logic
Scientific paper
Using extended sets of cosmological hydro-dynamical simulations of galaxy clusters, we present a detailed study of scaling relations between the total mass and three mass proxies based on X-ray observable quantities: temperature, gas mass, and the product of the two, YX. Our analysis is based on 140 clusters (M_vir > 5e13 Msun/h) with 30 objects having mass larger than 1e15 Msun/h at redshift 0. The large statistics is used to quantify the robustness of the scaling relations, to determine their redshift evolution, and to calibrate their intrinsic scatter and its distribution. We further use another set of 18 objects simulated with 7 different recipes for the physics of the gas to test the robustness of mass proxies against plasma physics.
We supplement this intrinsic analysis of simulations, including observational effect expected when measuring the X-ray cluster temperature and gas mass. For this purpose, we create more than 300 events files reproducing Chandra observations and analyze them through the standard X-ray data reduction pipeline.
We find that the M-YX relation to be the least sensitive to variations of the ICM physics, its slope, and redshift evolution being always very close to the self-similar prediction. The scatter distribution around the best-fitting relations is always close to log-normal. The gas mass is the mass proxy with smallest scatter, with a mild dependence in redshift. These results confirm that both YX and the gas mass are well suited mass proxies for cosmological applications of future large X-ray surveys.
[This work has been partially supported by PRIN-MIUR grant by ASI-AAE and ASI-COFIN; by the INFN-PD51 grant, by HPC-Europa Translational Access program, by DFG Priority Program 1177 and by DFG Cluster of Excellence].
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