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arXiv 1602.02775astro-ph.GA
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哈勃前沿场中的年轻星系候选者- III。MACSJ0717 .5+3745

Young Galaxy Candidates in the Hubble Frontier Fields - III. MACSJ0717.5+3745

N. Laporte, L. Infante, P. Troncoso Iribarren, W. Zheng, A. Molino, F. E. Bauer, D. Bina, Tom Broadhurst, I. Chilingarian, S. Garcia, S. Kim, R. Marques-Chaves,… 展开作者

N. Laporte, L. Infante, P. Troncoso Iribarren, W. Zheng, A. Molino, F. E. Bauer, D. Bina, Tom Broadhurst, I. Chilingarian, S. Garcia, S. Kim, R. Marques-Chaves, J. Moustakas, R. Pelló, I. Pérez-Fournon, X. Shu, A. Streblyanska, A. Zitrin

摘要:

本文结合哈勃望远镜和斯皮策望远镜的观测数据,对第三前沿场星系团MACSJ0717.5+3745及其平行场后面的$z \gtrsim 6$星系候选星系进行了研究。我们使用Lyman Break技术选择了39个候选者,对于这些候选者,在光学上明显未检测到使得极端中期$z$闯入者假说不太可能。我们还利用$z \gtrsim 6$样本选择使用以前的前沿领域数据集的阿贝尔2744和MACS 0416,以改善非常高红移对象的属性的约束。我们计算红移和物理性质,如发射线的属性,恒星形成率,红化,和恒星质量的所有前沿领域的对象从他们的光谱能量分布使用模板,包括星云发射线。我们研究了几个物理性质之间的关系,并确认在以前的调查中已经观察到的趋势与星系质量的恒星形成率的演变,以及我们的候选人的大小和紫外线光度之间。对紫外光度函数随红移的演化的分析似乎与密度的演化更相容。此外,没有强大的$z\ge$ 8.5对象被选择背后的集群领域,和几个$z$ $\sim$ 9候选人已被选择在两个以前的数据集从这个传统的调查,这表明在$z$ $\sim$ 8和9之间的星系数量密度的强烈演变。由于使用的透镜星系团,我们研究的恒星形成率密度的演变产生的星系L $>$ 0.03 L $^{\star}$,并确认$z$ $\sim$ 8和9之间观察到的强烈下降。

英文摘要:

In this paper we present the results of our search for and study of $z \gtrsim 6$ galaxy candidates behind the third Frontier Fields (FF) cluster, MACSJ0717.5+3745, and its parallel field, combining data from Hubble and Spitzer. We select 39 candidates using the Lyman Break technique, for which the clear non-detection in optical make the extreme mid-$z$ interlopers hypothesis unlikely. We also take benefit from $z \gtrsim 6$ samples selected using previous Frontier Fields datasets of Abell 2744 and MACS0416 to improve the constraints on the properties of very high-redshift objects. We compute the redshift and the physical properties, such emission lines properties, star formation rate, reddening, and stellar mass for all Frontier Fields objects from their spectral energy distribution using templates including nebular emission lines. We study the relationship between several physical properties and confirm the trend already observed in previous surveys for evolution of star formation rate with galaxy mass, and between the size and the UV luminosity of our candidates. The analysis of the evolution of the UV Luminosity Function with redshift seems more compatible with an evolution of density. Moreover, no robust $z\ge$8.5 object is selected behind the cluster field, and few $z$$\sim$9 candidates have been selected in the two previous datasets from this legacy survey, suggesting a strong evolution in the number density of galaxies between $z$$\sim$8 and 9. Thanks to the use of the lensing cluster, we study the evolution of the star formation rate density produced by galaxies with L$>$0.03L$^{\star}$, and confirm the strong decrease observed between $z$$\sim$8 and 9.

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