arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1907.10985astro-ph.COastro-ph.GA
收藏

Z = 1.99时星系团Cl J1449 +0856的Sunyaev-Zel'dovich探测:紫外空间的压力分布

Sunyaev-Zel'dovich detection of the galaxy cluster Cl J1449+0856 at z = 1.99: the pressure profile in uv space

R. Gobat, E. Daddi, R. T. Coogan, A. M. C. Le Brun, F. Bournaud, J. -B. Melin, D. A. Riechers, M. Sargent, F. Valentino, H. S. Hwang, A. Finoguenov, V. Strazzullo

摘要:

我们提出了阿塔卡马大型毫米阵列和阿塔卡马紧凑阵列观测的Sunyaev-Zel'dovich效应的z = 2星系团Cl J1449+0856,X射线探测到的祖先的典型的大质量星系团在今天的宇宙。虽然在该集群的清洁但未触及的92 GHz图中,几乎看不到负信号,但仔细减去uv平面中的已知亚毫米发射器,显示出5 $σ$显著性的递减。总信号为-190 $\pm$ 36 $μ$ Jy,峰值与X射线质心和仍在形成中的最亮星系团的距离为5”-9”($\sim$ 50 kpc)。恢复的UV振幅轮廓的递减与不同的压力模型的比较,使我们能够推导出与$\sim$ 6 $\times$ 10 $^{13}$ M $_{\odot}$从X射线数据估计的总质量约束。此外,我们没有发现强有力的证据,相对于当地的星系团的压力分布的偏差,虽然在小到中等的空间尺度轻微的张力表明一个扁平的中央配置文件,在一个冷的核心和可能的活动星系核相关的影响。这一分析的最低质量的单SZ检测到目前为止,说明了在观察SZ效应在高红移集群,其核心不能被认为是静态的,这样的星系发射仔细减法干涉仪的重要性是必要的。

英文摘要:

We present Atacama Large Millimetre Array and Atacama Compact Array observations of the Sunyaev-Zel'dovich effect in the z = 2 galaxy cluster Cl J1449+0856, an X-ray-detected progenitor of typical massive clusters in the present day Universe. While in a cleaned but otherwise untouched 92 GHz map of this cluster, little to no negative signal is visible, careful subtraction of known sub-millimetre emitters in the uv plane reveals a decrement at 5$σ$ significance. The total signal is -190$\pm$36 $μ$Jy, with a peak offset by 5"-9" ($\sim$50 kpc) from both the X-ray centroid and the still-forming brightest cluster galaxy. A comparison of the recovered uv-amplitude profile of the decrement with different pressure models allows us to derive total mass constraints consistent with the $\sim$6$\times$10$^{13}$ M$_{\odot}$ estimated from X-ray data. Moreover, we find no strong evidence for a deviation of the pressure profile with respect to local galaxy clusters, although a slight tension at small-to-intermediate spatial scales suggests a flattened central profile, opposite to what seen in a cool core and possibly an AGN-related effect. This analysis of the lowest mass single SZ detection so far illustrates the importance of interferometers when observing the SZ effect in high-redshift clusters, the cores of which cannot be considered quiescent, such that careful subtraction of galaxy emission is necessary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑