论文标题
阿尔玛（Alma
Galaxy clusters at z~1 imaged by ALMA with the Sunyaev-Zel'dovich effect
论文作者
论文摘要
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由Subaru上的Hyper Suprime-Cam和来自Atacama Cosmology望远镜的毫米波SZE数据。考虑到与球形对称性的偏离，我们对RCS J2319+0038的两个簇的内部压力曲线以及电子温度和密度曲线进行了非参数重建。这是$ z \ gtrsim 0.9 $的单个群集的第一个测量之一。我们发现，这两个簇的内部压力曲线比局部冷核簇的浅层要浅得多。我们的结果一致地表明，RCS J2319+0038容纳一个弱的冷却芯，其中辐射冷却不如局部冷却核心。另一方面，HSC J0947-0119表现出比RCS J2319+0038更浅的压力曲线，并且更可能是一个非冷核群集。 SZE Centroid位置被超过140 $ H_ {70}^{ - 1} $ kpc从HSC J0947-0119中的星系分布的峰值中抵消，这表明合并在该集群中的影响更大。我们得出的结论是，这些遥远的簇正处于在较低的红移簇中开发通常在簇中发现的凉爽岩心的早期阶段。
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.
