A comparison of pre-existing ΛCDM predictions with the abundance of JWST galaxies at high redshift
arxiv(2024)
摘要
Observations with the James Webb Space Telescope have revealed a high
abundance of bright galaxies at redshift, z≳ 12, which has been widely
interpreted as conflicting with the ΛCDM model. In Cowley et al. (2018)
predictions were made - prior to the JWST observations - for the expected
abundance of these galaxies using the Durham semi-analytic galaxy formation
model, GALFORM, which is known to produce a realistic population of galaxies at
lower redshifts including the present day. Key to this model is the assumption
of a "top-heavy" initial mass function of stars formed in bursts (required to
explain the number counts and redshift distribution of sub-millimetre
galaxies). Here, we compare the rest-frame ultraviolet luminosity functions
derived from JWST observations with those predicted by the Cowley et al. model
up to z=14 and make further predictions for z=16. We find that below z∼
10, the Cowley et al. predictions agree very well with observations, while
agreement at z≳12 requires extending the model to take into account the
timescale for the growth of obscuring dust grains and its dependence on gas
metallicity. We trace the evolution of these galaxies from z=14 to z=0 and
find that their descendants typically reside in halos with a median mass of
10^13.6 h^-1 M_⊙. The stellar masses of the descendants
range from 10^7 h^-1 M_⊙ to
10^11.5 h^-1 M_⊙. Although these galaxies were all
central galaxies at z=14, nearly half of their descendants end up as
satellites in massive halos.
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