AffiliationUniv Arizona, Dept Astron
Univ Arizona, Steward Observ
MetadataShow full item record
PublisherOXFORD UNIV PRESS
CitationPeter Behroozi, Joseph Silk; The most massive galaxies and black holes allowed by ΛCDM, Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 4, 11 July 2018, Pages 5382–5387, https://doi.org/10.1093/mnras/sty945
Rights© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
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AbstractGiven a galaxy's stellar mass, its host halo mass has a lower limit from the cosmic baryon fraction and known baryonic physics. At z> 4, galaxy stellar mass functions place lower limits on halo number densities that approach expected Lambda Cold Dark Matter halo mass functions. High-redshift galaxy stellar mass functions can thus place interesting limits on number densities of massive haloes, which are otherwise very difficult to measure. Although halo mass functions at z < 8 are consistent with observed galaxy stellar masses if galaxy baryonic conversion efficiencies increase with redshift, JWST (James Webb Space Telescope) and WFIRST (Wide-Field InfraRed Survey Telescope) will more than double the redshift range over which useful constraints are available. We calculate maximum galaxy stellar masses as a function of redshift given expected halo number densities from Lambda CDM. We apply similar arguments to black holes. If their virial mass estimates are accurate, number density constraints alone suggest that the quasars SDSS J1044-0125 and SDSS J010013.02+280225.8 likely have black hole mass to stellar mass ratios higher than the median z = 0 relation, confirming the expectation from Lauer bias. Finally, we present a public code to evaluate the probability of an apparently Lambda CDM-inconsistent high-mass halo being detected given the combined effects of multiple surveys and observational errors.
VersionFinal published version
SponsorsNational Aeronautics and Space Administration (NASA) through a Hubble Fellowship grant from the Space Telescope Science Institute, under NASA [NAS5-26555]; European Research Council ; [HST-HF2-51353.001-A]