AffiliationUniv Arizona, Dept Phys
Univ Arizona, Dept Phys, Appl Math Program
Univ Arizona, Dept Astron
MetadataShow full item record
PublisherELSEVIER SCIENCE BV
CitationYennapureddy, M. K., & Melia, F. (2018). A cosmological solution to the Impossibly Early Galaxy Problem. Physics of the dark universe, 20, 65-71.
JournalPHYSICS OF THE DARK UNIVERSE
Rights© 2018 Elsevier B.V. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractTo understand the formation and evolution of galaxies at redshifts 0 less than or similar to z less than or similar to 10, one must invariably introduce specific models (e.g., for the star formation) in order to fully interpret the data. Unfortunately, this tends to render the analysis compliant to the theory and its assumptions, so consensus is still some-what elusive. Nonetheless, the surprisingly early appearance of massive galaxies challenges the standard model, and the halo mass function estimated from galaxy surveys at z greater than or similar to 4 appears to be inconsistent with the predictions of Lambda CDM, giving rise to what has been termed "The Impossibly Early Galaxy Problem" by some workers in the field. A simple resolution to this question may not be forthcoming. The situation with the halos themselves, however, is more straightforward and, in this paper, we use linear perturbation theory to derive the halo mass function over the redshift range 0 less than or similar to z less than or similar to 10 for the R-h = ct universe. We use this predicted halo distribution to demonstrate that both its dependence on mass and its very weak dependence on redshift are compatible with the data. The difficulties with Lambda CDM may eventually be overcome with refinements to the underlying theory of star formation and galaxy evolution within the halos. For now, however, we demonstrate that the unexpected early formation of structure may also simply be due to an incorrect choice of the cosmology, rather than to yet unknown astrophysical issues associated with the condensation of mass fluctuations and subsequent galaxy formation.
Note24 month embargo; available online 26 March 2018
VersionFinal accepted manuscript
SponsorsChinese Academy of Sciences Visiting Professorships [2012T1J0011]; Chinese State Administration of Foreign Experts Affairs [GDJ20120491013]