Scaling Relations and X-ray Properties of Moderate-Luminosity Galaxy Clusters from 0.3 < z < 0.6 with XMM-Newton

Abstract

We present new X-ray temperatures and improved X-ray luminosity estimates for 15 new and archival XMM-Newton observations of galaxy clusters at intermediate redshift with mass and luminosities near the galaxy group/cluster division (M2500 < $2.4\times 10^{14}{h}_{70}^{-1}{M}_{\odot }$, L < $2\times 10^{44}$ erg $s^{-1}$, 0.3< z < 0.6). These clusters have weak-lensing mass measurements based on Hubble Space Telescope observations of clusters representative of an X-ray selected sample (the ROSAT 160SD survey). The angular resolution of XMM-Newton allows us to disentangle the emission of these galaxy clusters from nearby point sources, which significantly contaminated previous X-ray luminosity estimates for six of the fifteen clusters. We extend cluster scaling relations between X-ray luminosity, temperature, and weak-lensing mass for low-mass, X-ray-selected clusters out to redshift $\approx$0.45. These relations are important for cosmology and the astrophysics of feedback in galaxy groups and clusters. Our joint analysis with a sample of 50 clusters in a similar redshift range but with larger masses (M500 < $21.9\times 10^{14}{M}_{\odot }$, $0.15\le z\le 0.55$) from the Canadian Cluster Comparison Project finds that within r2500, $M\propto L^{0.44+/-0.05}$, $T\propto L^{0.23+/-0.02}$, and $M\propto T^{1.9+/-0.2}$. The estimated intrinsic scatter in the M-L relation for the combined sample is reduced to ${\sigma }_{log(M|L)}=0.10$, from ${\sigma }_{log(M|L)}=0.26$ with the original ROSAT measurements. We also find an intrinsic scatter for the T-L relation, ${\sigma }_{log(T|L)}=0.07+/-0.01$.

13 pages, 6 figures, accepted for publication in the Astrophysical Journal

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