The Evolution of the Galaxy Cluster Luminosity-Temperature Relation
The Evolution of the Galaxy Cluster Luminosity-Temperature Relation
复制标题
星系团光度-温度关系的演化
DOI：
10.1086/344162
复制
发表时间：
2002
期刊：
影响因子：
--
通讯作者：
J. Henry
中科院分区：
文献类型：
--
作者：
M. Novicki;M. Sornig;J. Henry
我们分析了ASCA卫星观测到的两个星系团样本的光度-温度（L-T）关系。我们使用了32个高红移星团（0.3 < z < 0.6），53个低红移星团（z < 0.3），以及低和高红移数据集的组合。这是仅使用ASCA数据的两个巡天之一，并且拥有最多的高红移星团。我们假设星系团的热光度与其积分温度（未对冷却流进行校正）和红移之间存在幂律关系[Lbol，44 = CTα（1 + z）A]。我们发现，对于ΩM = 1.0，ΩΛ = 0.0的宇宙，A = 1.134 ± 1.66，α = 2.815 ± 0.42，log C = -1.167 ± 0.25;对于ΩM = 0.3，ΩΛ = 0.7的宇宙，A = 2.052 ± 1.63，α = 2.822 ± 0.43，log C = -1.126 ± 0.26（对于一个和两个感兴趣的参数，所有误差均为68%置信度）。我们发现，在常数kT处，该关系式中的色散对于ΩM = 1.0，ΩΛ = 0.0为Δ log L = 0.282，对于ΩM = 0.3，ΩΛ = 0.7为Δ log L = 0.283。合并数据集的结果和使用低和高红移星系团发现的结果是一致的，并且与宇宙学无关，与其他作者发现的先前L T3的估计一致。观察到的弱或零演化与产生L T3的模型的预测一致，该模型在星系团坍缩之前包含了初始的非引力能量源。
We analyzed the luminosity-temperature (L-T) relation for two samples of galaxy clusters that have been observed by the ASCA satellite. We used 32 high-redshift clusters (0.3 < z < 0.6), 53 low-redshift clusters (z < 0.3), and also the combination of the low- and high-redshift data sets. This is one of two surveys to use only ASCA data and has the largest number of high-redshift clusters. We assumed a power-law relation between the bolometric luminosity of the galaxy cluster and its integrated temperature (uncorrected for cooling flows) and redshift [Lbol, 44 = CTα(1 + z)A]. We found that for an ΩM = 1.0, ΩΛ = 0.0 universe, A = 1.134 ± 1.66, α = 2.815 ± 0.42, and log C = -1.167 ± 0.25, and for an ΩM = 0.3, ΩΛ = 0.7 universe, A = 2.052 ± 1.63, α = 2.822 ± 0.43, and log C = -1.126 ± 0.26 (all errors at 68% confidence for one and two interesting parameters). We found the dispersion at constant kT in this relation to be Δ log L = 0.282 for ΩM = 1.0, ΩΛ = 0.0, and Δ log L = 0.283 for ΩM = 0.3, ΩΛ = 0.7. The results for the combined data set and those found using the low- and high-redshift clusters are consistent and independent of cosmology, with previous estimates of L ∼ T3 found by other authors. The observed weak or zero evolution agrees with the predictions of models that produce L ∼ T3 incorporating an initial source of nongravitational energy before cluster collapse.