“Observing and analyzing” images from a simulated high-redshift universe

摘要: We investigate the high-redshift evolution of rest-frame UV-luminosity function (LF) galaxies via hydrodynamical cosmological simulations, coupled with an emulated observational astronomy pipeline that provides a direct comparison observations. do this by creating mock images and synthetic galaxy catalogs ≈100 arcmin-2 fields from numerical model at redshifts ≈4.5 to 10.4. include effects dust extinction point-spread (PSF) for Hubble WFC3 camera space also expected zodiacal background predict its effect on observations, including future missions such as James Webb Space Telescope (JWST). When our are fitted Schechter parameters, we faint-end slope (α) LF evolves α = -1.16-0.12z over redshift range z ≈ 4.5-7.7, in excellent agreement observations from, e.g., Hathi coworkers. However, 6-10.4, α(z) appears display shallower evolution, -1.79-0.03z. Augmenting simulations more detailed physics—specifically stellar winds supernovae (SN)—produces similar results. The shows overproduction galaxies, especially faint magnitudes, compared although discrepancy is reduced when taken into account.