Breaking degeneracies in the first galaxies with clustering
Breaking degeneracies in the first galaxies with clustering
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通过聚类打破第一批星系的简并性
DOI：
10.1093/mnrasl/slad115
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发表时间：
2023
影响因子：
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通讯作者：
Sabti, Nashwan
中科院分区：
文献类型：
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作者：
Muñoz, Julian B.;Mirocha, Jordan;Furlanetto, Steven;Sabti, Nashwan
高红移星系的紫外线光度函数(UVLF)对于理解第一批星系的形成和演化是必不可少的。然而，UVLF只测量星系的丰度，导致星系的平均光度和它的随机性之间的简并。在这里，我们展示了即将到来的JWST和ROMAN的星系团测量将能够打破这种简并，即使在红移≳10。首先，我们证明了目前斯巴鲁超质凸轮(HSC)测量的星系偏差在∼4-6指向相对紧密的晕-星系连接，具有较低的随机性。然后，我们证明了JWSTatz≳10观测到的较大的UVLf可以用增强的平均UV发射或增强的随机性来解释。然而，这两个模型预测了不同的星系偏向，这在JWST和Romansurveys中可能是可以区分的。因此，星系团的测量将为第一批星系和它们的暗物质晕之间的联系提供至关重要的见解，并确定JWST在运行第一年期间揭示的Z≳10星系丰度增强的根本原因。
The high-redshift galaxy UV luminosity function (UVLF) has become essential for understanding the formation and evolution of the first galaxies. Yet, UVLFs only measure galaxy abundances, giving rise to a degeneracy between the mean galaxy luminosity and its stochasticity. Here, we show that upcoming clustering measurements with theJWST, as well as with Roman, will be able to break this degeneracy, even at redshiftsz≳ 10. First, we demonstrate that current Subaru Hyper Suprime-Cam (HSC) measurements of the galaxy bias atz∼ 4–6 point to a relatively tight halo-galaxy connection, with low stochasticity. Then, we show that the larger UVLFs observed byJWSTatz≳ 10 can be explained with either a boosted average UV emission or an enhanced stochasticity. These two models, however, predict different galaxy biases, which are potentially distinguishable inJWSTandRomansurveys. Galaxy-clustering measurements, therefore, will provide crucial insights into the connection between the first galaxies and their dark-matter haloes, and identify the root cause of the enhanced abundance ofz≳ 10 galaxies revealed withJWSTduring its first year of operations.