Astrophys. J., 841, 5-5 (2017/May-3)
Testing for X-ray- differences and redshift evolution in the X-ray morphology of galaxy clusters.
NURGALIEV D., McDONALD M., BENSON B.A., BLEEM L., BOCQUET S., FORMAN W.R., GARMIRE G.P., GUPTA N., HLAVACEK-LARRONDO J., MOHR J.J., NAGAI D., RAPETTI D., STARK A.A., STUBBS C.W. and VIKHLININ A.
Abstract (from CDS):
We present a quantitative study of the X-ray morphology of galaxy clusters, as a function of their detection method and redshift. We analyze two separate samples of galaxy clusters: a sample of 36 clusters at 0.35 z 0.9 selected in the X-ray with the ROSAT PSPC 400 deg2 survey, and a sample of 90 clusters at 0.25 z 1.2 selected via the Sunyaev-Zel'dovich (SZ) effect with the South Pole Telescope. Clusters from both samples have similar-quality Chandra observations, which allow us to quantify their X-ray morphologies via two distinct methods: centroid shifts (w) and photon asymmetry (Aphot). The latter technique provides nearly unbiased morphology estimates for clusters spanning a broad range of redshift and data quality. We further compare the X-ray morphologies of X-ray- and SZ-selected clusters with those of simulated clusters. We do not find a statistically significant difference in the measured X-ray morphology of X-ray and SZ-selected clusters over the redshift range probed by these samples, suggesting that the two are probing similar populations of clusters. We find that the X-ray morphologies of simulated clusters are statistically indistinguishable from those of X-ray- or SZ-selected clusters, implying that the most important physics for dictating the large-scale gas morphology (outside of the core) is well-approximated in these simulations. Finally, we find no statistically significant redshift evolution in the X-ray morphology (both for observed and simulated clusters), over the range of z∼0.3 to z∼1, seemingly in contradiction with the redshift-dependent halo merger rate predicted by simulations.
© 2017. The American Astronomical Society. All rights reserved.
galaxies: clusters: general - galaxies: clusters: intracluster medium - X-rays: galaxies: clusters - X-rays: galaxies: clusters
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