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arXiv 2209.09503astro-ph.COastro-ph.GA
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利用Sunyaev-Zel'dovich效应的ALMA成像z~1星系团

Galaxy clusters at z~1 imaged by ALMA with the Sunyaev-Zel'dovich effect

T. Kitayama, S. Ueda, N. Okabe, T. Akahori, M. Hilton, J. P. Hughes, Y. Ichinohe, K. Kohno, E. Komatsu, Y. -T. Lin, H. Miyatake, M. Oguri, C. Sifón, S. Takakuwa… 展开作者

T. Kitayama, S. Ueda, N. Okabe, T. Akahori, M. Hilton, J. P. Hughes, Y. Ichinohe, K. Kohno, E. Komatsu, Y. -T. Lin, H. Miyatake, M. Oguri, C. Sifón, S. Takakuwa, M. Takizawa, T. Tsutsumi, J. van Marrewijk, E. J. Wollack

摘要:

利用阿塔卡玛大型毫米/亚毫米波阵列(ALMA)对两个星系团(Z=0.9的RCS J2319+0038和Z=1.1的HSC J 0947 -0119)的热Sunyaev-Zel'dovich效应(SZE)进行了高角分辨率测量。它们补充了可用的钱德拉X射线数据,斯巴鲁上的Hyper Suprime-Cam拍摄的光学数据,以及阿塔卡马宇宙学望远镜的毫米波SZE数据。考虑到偏离球对称,我们已经重建非参数的内部压力分布的两个集群,以及电子温度和密度分布的RCS J2319+0038。这是在$z \gtrsim 0.9$对单个集群进行的首次此类测量之一。我们发现,这两个集群的内部压力分布是浅得多的本地冷芯集群。我们的研究结果一致表明,RCS J2319+0038主机弱冷核心,辐射冷却是不太重要的比在本地冷核心。另一方面,HSC J 0947 -0119的压力分布比RCS J2319+0038更浅,更可能是一个非冷堆芯簇。SZE质心位置偏离HSC J 0947 -0119星系分布峰值超过140 $h_{70}^{-1}$ kpc,表明该星系团中合并的影响更强。我们的结论是,这些遥远的星系团是在一个非常早期的阶段发展的冷核心通常发现在星系团在较低的红移。

英文摘要:

We present high angular-resolution measurements of the thermal Sunyaev-Zel'dovich effect (SZE) toward two galaxy clusters, RCS J2319+0038 at z=0.9 and HSC J0947-0119 at z=1.1, by the Atacama Large Millimeter/submillimeter Array (ALMA) in Band 3. They are supplemented with available Chandra X-ray data, optical data taken by Hyper Suprime-Cam on Subaru, and millimeter-wave SZE data from the Atacama Cosmology Telescope. Taking into account departures from spherical symmetry, we have reconstructed non-parametrically the inner pressure profile of two clusters as well as electron temperature and density profiles for RCS J2319+0038. This is one of the first such measurements for an individual cluster at $z \gtrsim 0.9$. We find that the inner pressure profile of both clusters is much shallower than that of local cool-core clusters. Our results consistently suggest that RCS J2319+0038 hosts a weak cool core, where radiative cooling is less significant than in local cool cores. On the other hand, HSC J0947-0119 exhibits an even shallower pressure profile than RCS J2319+0038 and is more likely a non-cool-core cluster. The SZE centroid position is offset by more than 140 $h_{70}^{-1}$kpc from the peaks of galaxy distribution in HSC J0947-0119, suggesting a stronger influence of mergers in this cluster. We conclude that these distant clusters are at a very early stage of developing the cool cores typically found in clusters at lower redshifts.

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