http://arxiv.org/abs/2004.08479
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 (510^5 Msun < M_halo < 10^10 Msun). We also place new constraints on fuzzy dark matter models of m_a < 510^-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.
B. Liu, A. Schauer and V. Bromm
Tue, 21 Apr 20
3/90
Comments: 7 pages, 5 figures, submitted to MNRAS