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arXiv 1807.09768astro-ph.GAastro-ph.CO
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最遥远的SPT-SZ星系团中的星系群- I. $1.4\lesssim z\lesssim1.7$大质量星系团的环境猝灭

Galaxy populations in the most distant SPT-SZ clusters - I. Environmental quenching in massive clusters at $1.4\lesssim z\lesssim1.7$

V. Strazzullo, M. Pannella, J. J. Mohr, A. Saro, M. L. N. Ashby, M. B. Bayliss, S. Bocquet, E. Bulbul, G. Khullar, A. B. Mantz, S. A. Stanford, B. A. Benson, L.… 展开作者

V. Strazzullo, M. Pannella, J. J. Mohr, A. Saro, M. L. N. Ashby, M. B. Bayliss, S. Bocquet, E. Bulbul, G. Khullar, A. B. Mantz, S. A. Stanford, B. A. Benson, L. E. Bleem, M. Brodwin, R. E. A. Canning, R. Capasso, I. Chiu, A. H. Gonzalez, N. Gupta, J. Hlavacek-Larrondo, M. Klein, M. McDonald, E. Noordeh, D. Rapetti, C. Reichardt, T. Schrabback, K. Sharon, B. Stalder

摘要:

我们目前的第一个结果,从一个星系人口的研究中确定的最高红移星系团的2500度$^2$南极望远镜Sunyaev Zel'dovich效应(SPT-SZ)调查。星系团的选择是一阶独立的星系属性,使得SPT-SZ样本特别适合于星系团星系人口的研究。我们用{ \it哈勃}和{ \it斯皮策}太空望远镜对5个$z\gtrsim 1.4$,S/N $_{SZE}>$ 5星团进行了4波段成像,这些星团是在这个红移中已知的最稀有的最大质量的星团之一。所有五个都显示出明显的红色星系的密度过高,其颜色与最初的星系团红移估计一致。该样本中红移最高的星系团,$z\sim1.72$的SPT-CLJ 0459 -4947,是迄今为止发现的最远的$M_{500}>10^{14}~M_{\odot}$ ICM选择星系团,也是$z\gtrsim 1.7$该质量范围内仅有的三个已知星系团之一,无论选择如何。基于类紫外线光度分类的静止和恒星形成的星系,被动的部分在集群中心区域($r/r_{500}<0.7$)是高于在现场在相同的红移,相应的环境淬火效率通常在范围内的恒星质量$\log(M/M_{\odot})>10.85$的$\sim0.5-0.8$。我们已经探索了恒星形成的辐射对选择这个样本的影响,得出的结论是,这里研究的所有五个星团仍然可以用S/N $_{SZE}>$ 5检测到,即使它们具有与现场测量的相同的被动分数。因此,我们的研究结果指向一个有效的抑制恒星形成的大质量星系中的中心区域的最大质量的集群,发生早于$z\sim1.5$。[删节]

英文摘要:

We present first results from a galaxy population study in the highest redshift galaxy clusters identified in the 2500 deg$^2$ South Pole Telescope Sunyaev Zel'dovich effect (SPT-SZ) survey. The cluster selection is to first order independent of galaxy properties, making the SPT-SZ sample particularly well suited for cluster galaxy population studies. We carry out a 4-band imaging campaign with the {\it Hubble} and {\it Spitzer} Space Telescopes of the five $z\gtrsim 1.4$, S/N$_{SZE}>$5 clusters, that are among the rarest most massive clusters known at this redshift. All five show clear overdensities of red galaxies whose colors agree with the initial cluster redshift estimates. The highest redshift cluster in this sample, SPT-CLJ0459-4947 at $z\sim1.72$, is the most distant $M_{500}>10^{14}~M_{\odot}$ ICM-selected cluster discovered thus far, and is one of only three known clusters in this mass range at $z\gtrsim 1.7$, regardless of selection. Based on UVJ-like photometric classification of quiescent and star-forming galaxies, the passive fraction in the cluster central regions ($r/r_{500}<0.7$) is higher than in the field at the same redshift, with corresponding environmental quenching efficiencies typically in the range $\sim0.5-0.8$ for stellar masses $\log(M/M_{\odot})>10.85$. We have explored the impact of emission from star formation on the selection of this sample, concluding that all five clusters studied here would still have been detected with S/N$_{SZE}>$5, even if they had the same passive fraction as measured in the field. Our results thus point towards an efficient suppression of star formation in massive galaxies in the central regions of the most massive clusters, occurring already earlier than $z\sim1.5$. [Abridged]

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。

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