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arXiv 1311.7670astro-ph.CO
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用第一个哈勃前沿场星系团Abell 2744探测z>6宇宙

Probing the z>6 Universe with the first Hubble Frontier Fields cluster Abell 2744

Hakim Atek, Johan Richard, Jean-Paul Kneib, Benjamin Clement, Eiichi Egami, Harald Ebeling, Mathilde Jauzac, Eric Jullo, Nicolas Laporte, Marceau Limousin, Priyamvada Natarajan

摘要:

哈勃前沿场(HFF)计划将哈勃太空望远镜(HST)的能力与大质量星系团的引力透镜结合起来,以前所未有的深度探测遥远的宇宙。在这里,我们提出的第一个合并的HST和斯皮策观测的集群阿贝尔2744的结果。我们结合完整的近红外数据和辅助光学图像来寻找引力透镜高红移(z > 6)星系。我们报告了在源平面1.43弧分^[2]的总测量区域中,在z ~ 6-7处检测到15个I814-dropout候选者,在z ~ 8处检测到1个Y105-dropout候选者。我们的透镜模型的预测,使我们也可以确定五个多重成像系统位于红移之间的z ~ 6和z ~ 8。由于星系团中质量分布的限制,我们能够估计出校正完整性和放大效应的有效调查体积。这进而用于估计z ~ 6-8处的静止帧紫外光度函数(LF)。我们的LF结果与最近的空白场估计基本一致,证实了通过透镜群进行调查的可行性。尽管基于比最终数据集中将实现的更浅的观测,包括完整的ACS观测,但由于高度放大的调查区域,这里呈现的LF在z ~ 7处向下延伸到Muv ~ -18.5,在Muv ~ -15处识别出一个物体。这项早期的研究预测了使用大质量星系团作为宇宙望远镜的力量及其对空白领域的补充。

英文摘要:

The Hubble Frontier Fields (HFF) program combines the capabilities of the Hubble Space Telescope (HST) with the gravitational lensing of massive galaxy clusters to probe the distant Universe to an unprecedented depth. Here, we present the results of the first combined HST and Spitzer observations of the cluster Abell 2744. We combine the full near-infrared data with ancillary optical images to search for gravitationally lensed high-redshift (z > 6) galaxies. We report the detection of 15 I814-dropout candidates at z ~ 6-7 and one Y105-dropout at z ~ 8 in a total survey area of 1.43 arcmin^2 in the source plane. The predictions of our lens model allow us to also identify five multiply-imaged systems lying at redshifts between z ~ 6 and z ~ 8. Thanks to constraints from the mass distribution in the cluster, we were able to estimate the effective survey volume corrected for completeness and magnification effects. This was in turn used to estimate the rest-frame ultraviolet luminosity function (LF) at z ~ 6-8. Our LF results are generally in agreement with the most recent blank field estimates, confirming the feasibility of surveys through lensing clusters. Although based on a shallower observations than what will be achieved in the final dataset including the full ACS observations, the LF presented here extends down to Muv ~ -18.5 at z ~ 7 with one identified object at Muv ~ -15 thanks to the highly-magnified survey areas. This early study forecasts the power of using massive galaxy clusters as cosmic telescopes and its complementarity to blank fields.

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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