Scaling relations and X-ray properties of moderate-luminosity galaxy clusters from 0.3 < z < 0.6 with XMM-Newton
- Department of Physics and Astronomy, Michigan State University, East Lansing, MI 48823 (United States)
- Department of Physics, University of Alabama in Huntsville, Huntsville, AL 35899 (United States)
- Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA, Leiden (Netherlands)
- Department of Physics and Astronomy, San Francisco State University, San Francisco, CA 94131 (United States)
- University of Nottingham, School of Physics and Astronomy, Nottingham NG7 2RD (United Kingdom)
- Department of Physics and Astronomy, University of Waterloo, 200 University Avenue West, Waterloo, Ontario N2L 5M3 (Canada)
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 (M{sub 2500}<2.4×10{sup 14} h{sub 70}{sup −1} M{sub ⊙}, L < 2 × 10{sup 44} erg s{sup –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 6 of the 15 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 ∼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 (M {sub 500} < 21.9 × 10{sup 14} M {sub ☉}, 0.15 ≤ z ≤ 0.55) from the Canadian Cluster Comparison Project finds that within r {sub 2500}, M∝L {sup 0.44±0.05}, T∝L {sup 0.23±0.02}, and M∝T {sup 1.9±0.2}. The estimated intrinsic scatter in the M-L relation for the combined sample is reduced to σ{sub log(M|L)} = 0.10, from σ{sub log} {sub (M|L)} = 0.26 with the original ROSAT measurements. We also find an intrinsic scatter for the T-L relation, σ{sub log} {sub (T|L)} = 0.07 ± 0.01.
- OSTI ID:
- 22370484
- Journal Information:
- Astrophysical Journal, Vol. 794, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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