The WARPS survey - IV. The X-ray luminosity-temperature relation of high-redshift galaxy clusters

被引:49
作者
Fairley, BW [1 ]
Jones, LR
Scharf, C
Ebeling, H
Perlman, E
Horner, D
Wegner, G
Malkan, M
机构
[1] Univ Birmingham, Sch Phys & Astron, Birmingham B15 2TT, W Midlands, England
[2] Space Telescope Sci Inst, Baltimore, MD 21218 USA
[3] Univ Hawaii, Inst Astron, Honolulu, HI 96822 USA
[4] Johns Hopkins Univ, Dept Phys & Astron, Baltimore, MD 21218 USA
[5] NASA, High Energy Astrophys Lab, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA
[6] Univ Maryland, College Pk, MD 20742 USA
[7] Dartmouth Coll, Dept Phys & Astron, Hanover, NH 03755 USA
[8] Univ Calif Los Angeles, Dept Astron, Los Angeles, CA 90024 USA
关键词
methods : data analysis; surveys; galaxies : clusters : general cosmology : observations; X-rays : galaxies;
D O I
10.1046/j.1365-8711.2000.03512.x
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
We present a measurement of the cluster X-ray luminosity-temperature (L-T) relation out to high redshift (z similar to 0.8). Combined ROSAT PSPC spectra of 91 galaxy clusters detected in the Wide Angle ROSAT Pointed Survey (WARPS) are simultaneously fitted in redshift and luminosity bins. The resulting temperature and luminosity measurements of these bins, which occupy a region of the high-redshift L-T relation not previously sampled, are compared with existing measurements at low redshift in order to constrain the evolution of the L-T relation. We find the best fit to low-redshift (z < 0.2) cluster data, at T > 1 keV, to be L proportional to T3.15 +/- 0.06. Our data are consistent with no evolution in the normalization of the L-T relation up to z similar to 0.8. Combining our results with ASCA measurements taken from the literature, we find eta = 0.19 +/- 0.38 (for Omega(0) = 1, with 1 sigma errors) where L-Bol proportional to (1 + z)T-eta(3.15), or eta = 0.60 +/- 0.38 for Omega(0) = 0.3. This lack of evolution is considered in terms of the entropy-driven evolution of clusters. Further implications for cosmological constraints are also discussed.
引用
收藏
页码:669 / 678
页数:10
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