The Clusters Hiding in Plain Sight (CHiPS) Survey: Complete Sample of Extreme BCG Clusters
The Clusters Hiding in Plain Sight (CHiPS) Survey: Complete Sample of Extreme BCG Clusters
复制标题
DOI：
10.3847/1538-4357/abe1bc
复制
发表时间：
2021-01
期刊：
影响因子：
--
通讯作者：
T. Somboonpanyakul;M. McDonald;M. Gaspari;B. Stalder;A. Stark
中科院分区：
文献类型：
--
作者：
T. Somboonpanyakul;M. McDonald;M. Gaspari;B. Stalder;A. Stark
我们目前的光学后续观测候选集群隐藏在平原视线调查，其目的是寻找新的星系团与极端的中央星系被错误地识别为明亮的孤立源ROSAT全天巡天目录。我们在X射线、射电和中红外亮源周围确定了11个簇候选者，包括6个著名的簇，两个前景和背景簇的错误关联，以及3个新的候选者，这些候选者将进一步与Chandra一起观察。在三个新的候选者中，我们确认了两个新发现的星系团：CHIPS 1356-3421和CHIPS 1911+4455。这两个星团都足够明亮，如果不是因为它们明亮的中央核心，就可以在ROSAT全天巡天数据中检测到。CHIPS 1911+4455在许多方面与凤凰星团相似，但在大尺度上具有高度扰动的X射线形态。我们发现，在ROSAT全天巡天（以及任何具有类似角分辨率的巡天）中，似乎是X射线亮点源的星团的出现率为2% ± 1%，核心冷却失控的星团的出现率<1%，与混沌冷吸积的预测一致。随着新的星系团和星系团的数量预测将被发现与eROSITA，似乎是点源的星系团的人口（由于中央类星体或密集的冷核心）可能是2000左右。最后，这次调查表明凤凰星系团可能是z < 0.7的最强冷核-任何更极端的都可能在这次调查中发现。
We present optical follow-up observations for candidate clusters in the Clusters Hiding in Plain Sight survey, which is designed to find new galaxy clusters with extreme central galaxies that were misidentified as bright isolated sources in the ROSAT All-Sky Survey catalog. We identify 11 cluster candidates around X-ray, radio, and mid-IR-bright sources, including six well-known clusters, two false associations of foreground and background clusters, and three new candidates, which are observed further with Chandra. Of the three new candidates, we confirm two newly discovered galaxy clusters: CHIPS 1356-3421 and CHIPS 1911+4455. Both clusters are luminous enough to be detected in the ROSAT All-Sky Survey data if not because of their bright central cores. CHIPS 1911+4455 is similar in many ways to the Phoenix cluster, but with a highly disturbed X-ray morphology on large scales. We find the occurrence rate for clusters that would appear to be X-ray-bright point sources in the ROSAT All-Sky Survey (and any surveys with similar angular resolution) to be 2% ± 1%, and the occurrence rate of clusters with runaway cooling in their cores to be <1%, consistent with predictions of chaotic cold accretion. With the number of new groups and clusters predicted to be found with eROSITA, the population of clusters that appear to be point sources (due to a central QSO or a dense cool core) could be around 2000. Finally, this survey demonstrates that the Phoenix cluster is likely the strongest cool core at z < 0.7—anything more extreme would have been found in this survey.