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arXiv 2107.03403astro-ph.GA
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GOGREEN调查:$1.0<z<1.4$星团中静止盘过剩的证据

The GOGREEN Survey: Evidence of an excess of quiescent disks in clusters at $1.0<z<1.4$

Jeffrey C. C. Chan, Gillian Wilson, Michael Balogh, Gregory Rudnick, Remco F. J. van der Burg, Adam Muzzin, Kristi A. Webb, Andrea Biviano, Pierluigi Cerulo, M.… 展开作者

Jeffrey C. C. Chan, Gillian Wilson, Michael Balogh, Gregory Rudnick, Remco F. J. van der Burg, Adam Muzzin, Kristi A. Webb, Andrea Biviano, Pierluigi Cerulo, M. C. Cooper, Gabriella De Lucia, Ricardo Demarco, Ben Forrest, Pascale Jablonka, Chris Lidman, Sean L. McGee, Julie Nantais, Lyndsay Old, Irene Pintos-Castro, Bianca Poggianti$, Andrew M. M. Reeves, Benedetta Vulcani, Howard K. C. Yee, Dennis Zaritsky

摘要:

本文给出了GOGREEN巡天11个星系团中832个星系在1.0 < z <1.4时的形状测量结果。利用Sérsic轮廓拟合方法测量了哈勃空间望远镜近红外成像的星系团的短轴与长轴之比($q$),并与野外样品进行了比较。我们发现星系团中恒星形成星系和静止星系的中值$q$都随着恒星质量的增加而增加,这与磁场相似。通过比较四个质量仓中星系团与场的轴比分布,发现成星星系在星系团中的轴比分布与场中的轴比分布是一致的。相反,静止星系在两种环境中的分布是不同的,最明显的是在$10.1\leq\log(M/{\rm M}_{\odot})<10.5$,那里的星系团显示出一个平坦的分布,在低$q$过量。模拟扁圆和三轴分量的分布,我们发现,集群和现场样本的差异是一致的,在集群中的扁平扁圆静止星系过剩。扁圆布居贡献在高质量时下降,导致大质量布居中的$q$分布比低质量时窄。使用一个简单的吸积模型,我们表明,所观察到的$q$分布和淬火分数是一致的情况下,没有发生形态转变的环境淬火人口在两个中间质量箱。我们的研究结果表明,环境淬灭机制(S)可能会产生一个人口,有一个不同的形态混合比那些从占主导地位的淬灭机制在外地。

英文摘要:

We present results on the measured shapes of 832 galaxies in 11 galaxy clusters at 1.0 < z <1.4 from the GOGREEN survey. We measure the axis ratio ($q$), the ratio of the minor to the major axis, of the cluster galaxies from near-infrared Hubble Space Telescope imaging using Sérsic profile fitting and compare them with a field sample. We find that the median $q$ of both star-forming and quiescent galaxies in clusters increases with stellar mass, similar to the field. Comparing the axis ratio distributions between clusters and the field in four mass bins, the distributions for star-forming galaxies in clusters are consistent with those in the field. Conversely, the distributions for quiescent galaxies in the two environments are distinct, most remarkably in $10.1\leq\log(M/{\rm M}_{\odot})<10.5$ where clusters show a flatter distribution, with an excess at low $q$. Modelling the distribution with oblate and triaxial components, we find that the cluster and field sample difference is consistent with an excess of flattened oblate quiescent galaxies in clusters. The oblate population contribution drops at high masses, resulting in a narrower $q$ distribution in the massive population than at lower masses. Using a simple accretion model, we show that the observed $q$ distributions and quenched fractions are consistent with a scenario where no morphological transformation occurs for the environmentally quenched population in the two intermediate mass bins. Our results suggest that environmental quenching mechanism(s) likely produce a population that has a different morphological mix than those resulting from the dominant quenching mechanism in the field.

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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