高红移星系团中红序的加速建立
The Accelerated Build-up of the Red Sequence in High Redshift Galaxy Clusters
摘要：
我们分析了Hawk-1星系团巡天（HCS）中红移为$0.8<z<1.5$的星系团的红序列的演化。与宽场近星系团巡天（WINGS）的低红移（$0.04<z<0.08$）样本及其它文献结果的比较表明，自$z=1.5$以来，该星系团红序列的斜率和内禀散射几乎没有发生变化。我们发现HCS红序列的光度分布的亮暗比和暗端的斜率与WINGS测量的一致，这意味着在高红移时，在比$M_V^*$更暗的星等上没有红星系的亏损。我们发现，最大质量的HCS集群主机人口的明亮的红色序列星系在$M_V < -22.0$等，这是没有观察到的低质量的集群。有趣的是，我们还注意到在WINGS星系团中存在着一群非常明亮的（$M_V < -23.0$等）和大质量的（${\log(M_*/M_\odot)} > 11.5$）红色序列星系，这些星系不仅包括最明亮的星系团星系，而且不存在于HCS星系团中，这表明它们形成的时代晚于$z=0.8$。与从COSMOS/UltraVISTA场获得的被动红序星系样本在光度红移范围$0.8<z_{phot}<1.5$内的光度分布比较表明，星系团中的红序在暗端更为发达，表明晕质量在确定红序建立的时间尺度方面起着重要作用。
英文摘要：
We analyse the evolution of the red sequence in a sample of galaxy clusters at redshifts $0.8<z<1.5$ taken from the HAWK-I Cluster Survey (HCS). The comparison with the low-redshift ($0.04<z<0.08$) sample of the WIde-field Nearby Galaxy-cluster Survey (WINGS) and other literature results shows that the slope and intrinsic scatter of the cluster red sequence have undergone little evolution since $z=1.5$. We find that the luminous-to-faint ratio and the slope of the faint end of the luminosity distribution of the HCS red sequence are consistent with those measured in WINGS, implying that there is no deficit of red galaxies at magnitudes fainter than $M_V^*$ at high redshifts. We find that the most massive HCS clusters host a population of bright red sequence galaxies at $M_V < -22.0$ mag, which are not observed in low-mass clusters. Interestingly, we also note the presence of a population of very bright ($M_V < -23.0$ mag) and massive (${\log(M_*/M_\odot)} > 11.5$) red sequence galaxies in the WINGS clusters, which do not include only the brightest cluster galaxies and which are not present in the HCS clusters, suggesting that they formed at epochs later than $z=0.8$. The comparison with the luminosity distribution of a sample of passive red sequence galaxies drawn from the COSMOS/UltraVISTA field in the photometric redshift range $0.8<z_{phot}<1.5$ shows that the red sequence in clusters is more developed at the faint end, suggesting that halo mass plays an important role in setting the time-scales for the build-up of the red sequence.
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