Publication Date:
2016-06-15
Description:
Using deep Hubble and Spitzer observations Oesch et al. have identified a bright ( M UV –22) star-forming galaxy candidate at z 11. The presence of GN- z 11 implies a number density ~10 –6 Mpc –3 , roughly an order of magnitude higher than the expected value based on extrapolations from lower redshift. Using the unprecedented volume and high resolution of the B lue T ides cosmological hydrodynamical simulation, we study the population of luminous rare objects at z 〉 10. The luminosity function in B lue T ides implies an enhanced number of massive galaxies, consistent with the observation of GN- z 11. We find about 30 galaxies at M UV –22 at z = 11 in the B lue T ides volume, including a few objects about 1.5 mag brighter. The probability of observing GN- z 11 in the volume probed by Oesch et al. is ~13 per cent. The predicted properties of the rare bright galaxies at z = 11 in B lue T ides closely match those inferred from the observations of GN- z 11. B lue T ides predicts a negligible contribution from faint AGN in the observed SED. The enormous increase in volume surveyed by WFIRST will provide observations of ~1000 galaxies with M UV 〈 –22 beyond z = 11 out to z = 13.5.
Print ISSN:
1745-3925
Electronic ISSN:
1745-3933
Topics:
Physics
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