SZ簇中冷核的特征：多波长方法
Signature of cool cores in SZ clusters: a multiwavelength approach
摘要：
我们使用ACCEPT项目（Cavagnolo et al. 2009）提供的239个星系团的高质量压力剖面，以获得预期的Sunyaev Zeldovich（SZ）信号，在各种情况下，很难找到一个对应的模拟。我们使用了Melin et al.（2006）的星团选择函数，用于南极望远镜（SPT）和普朗克仪器。我们推断冷核（CC）对中心康普顿参数y_0有明显的影响。我们发现，CC的存在引入了一个小的偏差，在集群检测，特别是周围的质量在调查的性能开始下降。如果CC被移除，则预期检测到的簇的总体分数较低。为了估计这种偏差的存在，通过SZ只调查，我们表明，y_0和y_int之间的比率与集群的中心冷却时间的反相关。如果多波段光学星系团调查可用于交叉匹配或计划进行后续调查，我们建议可能的CC星系团是那些具有比平均值至少蓝0.3等的Brilliant Cluster Galaxy（BCG）的星系团。CC存在的更稳健估计由BCG的UV光学颜色给出，如NUV-r，其值可以是红色序列的NUV-r等效物的4个量级，在具有低过量熵的簇中。我们还发现y_0/y_int比值与H α、IR和射电光度之间存在相关性。我们认为，结合SZ/光学/UV调查的分析也可以用来阐明建议的CC红移的演变。（节略）
英文摘要：
We use the high quality pressure profiles of 239 galaxy clusters made available by the ACCEPT project (Cavagnolo et al. 2009) in order to derive the expected Sunyaev Zeldovich (SZ) signal in a variety of cases that hardly find a counterpart in the simulations. We made use of the Melin et al. (2006) cluster selection function for both the South Pole Telescope (SPT) and Planck instruments. We infer a clear effect of the cool core (CC) on the central Compton parameter y_0. We find that the presence of CCs introduces a small bias in cluster detection, especially around the mass at which the performance of the survey begins to decrease. If the CC were removed, a lower overall fraction of detected clusters would be expected. In order to estimate the presence of such a bias by means of SZ only surveys, we show that the ratio between y_0 and y_int anti-correlates with the cluster central cooling time. If multi-band optical cluster surveys are either available for a cross-match or a follow-up is planned, we suggest that likely CC clusters are those with a Brightest Cluster Galaxy (BCG) at least 0.3 magnitudes bluer than the average. A more robust estimate of the CC presence is given by UV-optical colours of the BCG, like the NUV-r, whose values can be 4 magnitudes off the NUV-r equivalent of the red sequence, in clusters with low excess entropy. We also find correlation of the y_0/y_int ratio with Halpha, IR and radio luminosities. We argue that the analysis of a combined SZ/optical/UV surveys can be also used to shed light on the suggested CC evolution with redshift. (abridged)
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