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arXiv 1802.08692astro-ph.CO
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在超级凸轮斯巴鲁战略计划领域中高丰度CAMIRA团簇的X射线特性

X-ray properties of high-richness CAMIRA clusters in the Hyper Suprime-Cam Subaru Strategic Program field

Naomi Ota, Ikuyuki Mitsuishi, Yasunori Babazaki, Hiroki Akamatsu, Yuto Ichinohe, Shutaro Ueda, Nobuhiro Okabe, Masamune Oguri, Ryuichi Fujimoto, Takashi Hamana,… 展开作者

Naomi Ota, Ikuyuki Mitsuishi, Yasunori Babazaki, Hiroki Akamatsu, Yuto Ichinohe, Shutaro Ueda, Nobuhiro Okabe, Masamune Oguri, Ryuichi Fujimoto, Takashi Hamana, Keita Miyaoka, Satoshi Miyazaki, Hanae Otani, Keigo Tanaka, Ayumi Tsuji, Atsushi Yoshida

摘要:

我们提出的第一个试点X射线研究的37个丰富的星系团在$0.1<z<1.1$在超级Suprime-Cam斯巴鲁战略计划(HSC-SSP)领域。在XMM-牛顿视野中偶然发现了这些星系团的弥散X射线发射。利用XMM-Newton存档数据,系统地分析了37个团簇的X射线图像和17个高光子统计团簇的子样本的发射光谱。对光学星系团样品,导出了最亮星系团的X射线质心或峰值与星系团位置偏移的频率分布。根据17个团簇的X射线峰偏移量估算的弛豫团簇的比例为$29\pm11(\pm13)$ %,小于HIFLUGCS等X射线团簇样品的比例。由于光学团簇搜索不受X射线发射气体的物理状态的影响,因此它可能覆盖更大范围的团簇形态。我们还推导了亮度-温度关系,发现斜率比X射线选择的样品略浅,与自相似模型预测2。因此,我们的研究结果表明,X射线性质的光学团簇是略有不同的观察到的X射线样品。最后对结果的意义和未来的展望作了简要的讨论。

英文摘要:

We present the first results of a pilot X-ray study of 37 rich galaxy clusters at $0.1<z<1.1$ in the Hyper Suprime-Cam Subaru Strategic Program (HSC-SSP) field. Diffuse X-ray emissions from these clusters were serendipitously detected in the XMM-Newton fields of view. We systematically analyze X-ray images of 37 clusters and emission spectra of a subsample of 17 clusters with high photon statistics by using the XMM-Newton archive data. The frequency distribution of the offset between the X-ray centroid or peak and the position of the brightest cluster galaxy was derived for the optical cluster sample. The fraction of relaxed clusters estimated from the X-ray peak offsets in 17 clusters is $29\pm11(\pm13)$\%, which is smaller than that of the X-ray cluster samples such as HIFLUGCS. Since the optical cluster search is immune to the physical state of X-ray-emitting gas, it is likely to cover a larger range of the cluster morphology. We also derived the luminosity-temperature relation and found that the slope is marginally shallower than those of X-ray-selected samples and consistent with the self-similar model prediction of 2. Accordingly, our results show that the X-ray properties of the optical clusters are marginally different from those observed in the X-ray samples. The implication of the results and future prospects are briefly discussed.

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