Finding High-redshift Galaxies with JWST
Finding High-redshift Galaxies with JWST
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DOI：
10.3847/1538-4357/ac2a2f
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发表时间：
2021-11
期刊：
影响因子：
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通讯作者：
C. Steinhardt;C. K. Jespersen;N. B. Linzer
中科院分区：
文献类型：
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作者：
C. Steinhardt;C. K. Jespersen;N. B. Linzer
即将到来的詹姆斯韦伯太空望远镜的主要目标之一是观察第一个星系。对计划和提议的调查的预测通常集中在平均星系数量上，假设星系在观测场的随机分布。然而，第一个也是质量最大的星系预计会紧密聚集在一起，这种效应被称为宇宙方差。我们发现，宇宙方差很可能是占主导地位的贡献，高红移质量和光度函数的不确定性，以及中位数高红移和高质量星系计数计划的观测位于显着低于平均计数。几种不同的策略被认为是为了提高我们对第一个星系的理解，包括增加深度，面积和独立点。添加独立的点被证明是最有效的发现一个最高的红移星系，也约束质量和光度功能。
One of the primary goals for the upcoming James Webb Space Telescope is to observe the first galaxies. Predictions for planned and proposed surveys have typically focused on average galaxy counts, assuming a random distribution of galaxies across the observed field. The first and most-massive galaxies, however, are expected to be tightly clustered, an effect known as cosmic variance. We show that cosmic variance is likely to be the dominant contribution to uncertainty for high-redshift mass and luminosity functions, and that median high-redshift and high-mass galaxy counts for planned observations lie significantly below average counts. Several different strategies are considered for improving our understanding of the first galaxies, including adding depth, area, and independent pointings. Adding independent pointings is shown to be the most efficient both for discovering the single highest-redshift galaxy and also for constraining mass and luminosity functions.