论文标题
从宇宙中午观察到的成熟星系簇的早期结构形成的教训
Lessons on early structure formation from a mature galaxy cluster observed at cosmic noon
论文作者
论文摘要
我们以宇宙中午（Z〜2）的成熟星系簇的形式间接约束早期恒星和结构形成的新方法，以群集XLSSC 122为例。使用标准的Schechter形式主义，我们根据XLSSC 122的Starburst星系中星系中星系的年龄分布，在Z〜20-13期间的恒星形成效率（恒星与光晕质量的比率）从10^-4到0.01，通过HST光量表散布了dust dust dustry dust dupplunction no dust dust dust no dust。在这里，我们考虑所有低质量光环（包括Minihaloes），它们容纳了第一批恒星和星系（5*10^5 msun <m_halo <10^10^10 msun）。我们还对超光玻色子质量的m_a <5*10^-21 eV/c^2的模糊暗物质模型放置了新的约束，这是从XLSSC 122中Z> 13处的Z> 13的恒星形成的大量星系。我们的探索结果与现有约束是一致的。如果我们的方法扩展到宇宙中午的大量群集或野外星系星系，将获得更全面的结果，并改善了光晕和恒星种群的建模。
We demonstrate a new approach of indirectly constraining both early star and structure formation via mature galaxy clusters at cosmic noon (z~2), using the cluster XLSSC 122 as an example. With the standard Press Schechter formalism, we infer a rapid evolution of the star formation efficiency (the ratio of stellar to halo mass) from 10^-4 to 0.01 during z~20-13, based on the age distribution of stars in post-starburst galaxies of XLSSC 122, measured by HST photometry assuming no dust extinction. Here, we consider all low-mass haloes, including minihaloes, that host the first stars and galaxies (5*10^5 Msun < M_halo < 10^10 Msun). We also place new constraints on fuzzy dark matter models of m_a < 5*10^-21 eV/c^2 for the ultra-light boson mass, from the abundance of galaxies with star formation at z > 13 in XLSSC 122. Our exploratory results are consistent with existing constraints. More comprehensive results will be obtained if our approach is extended to a large sample of clusters or field post-starburst galaxies at cosmic noon, with improved modelling of halo and stellar populations.
