The WARPS survey - IV. The X-ray luminosity-temperature relation of high-redshift galaxy clusters
The WARPS survey - IV. The X-ray luminosity-temperature relation of high-redshift galaxy clusters
复制标题
WARPS 调查 - IV。
DOI：
10.1046/j.1365-8711.2000.03512.x
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发表时间：
2000
影响因子：
4.8
通讯作者：
M. Malkan
中科院分区：
文献类型：
--
作者：
B. Fairley;L. Jones;C. Scharf;H. Ebeling;E. Perlman;D. Horner;G. Wegner;M. Malkan
我们提出了对高红移 (z∼0.8) 的星团 X 射线光度-温度 (L-T) 关系的测量。在广角 ROSAT 定点巡天 (WARPS) 中检测到的 91 个星系团的组合 ROSAT PSPC 光谱同时拟合到红移和光度箱中。这些箱的温度和光度测量结果占据了先前未采样的高红移 L-T 关系区域，与低红移下的现有测量结果进行比较，以限制 L-T 关系的演变。我们找到了低红移的最佳拟合（z 1 keV，为 L∝T3.15±0.06。我们的数据与 L-T 关系归一化到 z∼0.8 没有演变是一致的。将我们的结果与文献中的 ASCA 测量结果相结合，我们发现 η=0.19±0.38（对于 Ω0=1，有 1σ 误差），其中LBol∝(1+z)ηT3.15，或 Ω0=0.3 时 η=0.60±0.38。还讨论了宇宙学约束的进一步含义。
We present a measurement of the cluster X-ray luminosity–temperature (L–T) relation out to high redshift (z∼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 1 keV, to be L∝T3.15±0.06. Our data are consistent with no evolution in the normalization of the L–T relation up to z∼0.8. Combining our results with ASCA measurements taken from the literature, we find η=0.19±0.38 (for Ω0=1, with 1σ errors) where LBol∝(1+z)ηT3.15, or η=0.60±0.38 for Ω0=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.