聚焦宇宙望远镜：用子弹星系团1 E0657 - 5-6探测红移z~5-6星系团
Focusing Cosmic Telescopes: Exploring Redshift z~5-6 Galaxies with the Bullet Cluster 1E0657-56
摘要：
星系团的引力势就像一个宇宙望远镜，使我们能够在比其他方式更微弱的极限上发现和研究星系，从而更接近第一个星系形成的时代。我们使用子弹星系团1 E0657 -56（z = 0.296）作为案例研究，因为它的高质量和合并配置使其成为我们所知道的最有效的宇宙望远镜之一。我们开发了一种新的算法来重建子弹星系团的引力位，基于非均匀自适应网格，结合来自深HST/ACS F606 W-F775 W-F850 LP和地基成像的强和弱引力透镜数据。我们利用这个改进的质量图来研究z~5-6莱曼断裂半导体（LBG），我们检测到的辍学。其中一个LBG被多次成像，提供了其高红移的几何确认，并用于进一步改进我们的质量模型。我们量化的不确定性，在放大图重建的内在源光度，并在体积调查，并表明，它们是可以忽略不计的样本方差相比，当确定高红移星系的光度函数。子弹星系团的观测结果与HUDF和GOODS相比，具有更浅和可比的星等限制，在校正放大率后，比GOODS更深入地探索高红移星系的光度函数，仅比HUDF略浅。我们的结论是，准确聚焦的宇宙望远镜是最有效的方式来采样高红移星系的光度函数的亮端，并在情况下，他们是多重成像确认其红移。
英文摘要：
The gravitational potential of clusters of galaxies acts as a cosmic telescope allowing us to find and study galaxies at fainter limits than otherwise possible and thus probe closer to the epoch of formation of the first galaxies. We use the Bullet Cluster 1E0657-56 (z = 0.296) as a case study, because its high mass and merging configuration makes it one of the most efficient cosmic telescopes we know. We develop a new algorithm to reconstruct the gravitational potential of the Bullet Cluster, based on a non-uniform adaptive grid, combining strong and weak gravitational lensing data derived from deep HST/ACS F606W-F775W-F850LP and ground-based imaging. We exploit this improved mass map to study z~5-6 Lyman Break Galaxies (LBGs), which we detect as dropouts. One of the LBGs is multiply imaged, providing a geometric confirmation of its high redshift, and is used to further improve our mass model. We quantify the uncertainties in the magnification map reconstruction in the intrinsic source luminosity, and in the volume surveyed, and show that they are negligible compared to sample variance when determining the luminosity function of high-redshift galaxies. With shallower and comparable magnitude limits to HUDF and GOODS, the Bullet cluster observations, after correcting for magnification, probe deeper into the luminosity function of the high redshift galaxies than GOODS and only slightly shallower than HUDF. We conclude that accurately focused cosmic telescopes are the most efficient way to sample the bright end of the luminosity function of high redshift galaxies and - in case they are multiply imaged - confirm their redshifts.
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。
