Computer Science – Performance
Scientific paper
Mar 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.0909z&link_type=abstract
American Astronomical Society, HEAD meeting #10, #9.09
Computer Science
Performance
Scientific paper
Several lines of evidence have suggested that the the galaxy cluster Cl0024+17, an apparently relaxed system, is actually a collision of two clusters, the interaction occurring along our line of sight. In this paper we present a N-body/hydrodynamics simulation of such a collision between two galaxy clusters. We have created mock X-ray observations of our simulated system using MARX, a program that simulates the on-orbit performance of the Chandra X-ray Observatory. We analyze this simulated data to generate profiles of the surface brightness and temperature profiles. The surface brightness profiles are better fit by a superposition of two β-model profiles rather than a single profile, in agreement with the observations of Cl 0024+17. However, due to projection effects, much of the density and temperature structure of the clusters post-collision is not seen in the observations. In particular, the observed temperatures from spectral fitting are lower than the temperature of the highest-temperature gas in the clusters. We determine from our fitted profiles that if the system is modeled as a single cluster, then the hydrostatic mass estimate is a factor 2-3 less than the actual mass, but if the system is modeled as two galaxy clusters in superposition, a hydrostatic mass estimation can be made which is accurate to within 10-20%.
Lamb Dennis
Ricker Paul
Yang Hui-jie
ZuHone John
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