2017/06/30 by Xiangcheng Ma, Philip F. Hopkins, Shea Garrison-Kimmel +6
Physics and Astronomy · #astro-ph.GA #astro-ph.CO
paper · pdf · doi:10.1093/mnras/sty1024
23 pages, 17 figures, resubmitted to MNRAS after minor revision. The predicted stellar mass functions and luminosity functions are made publicly available (see Appendix C for details)
arxiv created 2018/03/29 · arxiv updated 2018/05/22
We present a suite of cosmological zoom-in simulations at z>5 from the Feedback In Realistic Environments project, spanning a halo mass range Mhalo~108-1012 Msun at z=5. We predict the stellar mass-halo mass relation, stellar mass function, and luminosity function in several bands from z=5-12. The median stellar mass-halo mass relation does not evolve strongly at z=5-12. The faint-end slope of the luminosity function steepens with increasing redshift, as inherited from the halo mass function at these redshifts. Below z~6, the stellar mass function and ultraviolet (UV) luminosity function slightly flatten below Mstar~104.5 Msun (fainter than M1500~-12), owing to the fact that star formation in low-mass halos is suppressed by the ionizing background by the end of reionization. Such flattening does not appear at higher redshifts. We provide redshift-dependent fitting functions for the SFR-Mhalo, SFR-Mstar, and broad-band magnitude-stellar mass relations. We derive the star formation rate density and stellar mass density at z=5-12 and show that the contribution from very faint galaxies becomes more important at z>8. Furthermore, we find that the decline in the z~6 UV luminosity function brighter than M1500~-20 is largely due to dust attenuation. Approximately 37% (54%) of the UV luminosity from galaxies brighter than M1500=-13 (-17) is obscured by dust at z~6. Our results broadly agree with current data and can be tested by future observations.