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27 April 2024 |
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The Evolution of the Galaxy Rest-Frame Ultraviolet Luminosity Function Over the First Two Billion Years | Steven L. Finkelstein
; Russell E. Ryan Jr.
; Casey Papovich
; Mark Dickinson
; Mimi Song
; Rachel Somerville
; Henry C. Ferguson
; Brett Salmon
; Mauro Giavalisco
; Anton M. Koekemoer
; Matthew L. N. Ashby
; Peter Behroozi
; Marco Castellano
; James S. Dunlop
; Sandy M. Faber
; Giovanni G. Fazio
; Adriano Fontana
; Norman A. Grogin
; Nimish Hathi
; Jason Jaacks
; Dale D. Kocevski
; Rachael Livermore
; Ross J. McLure
; Emiliano Merlin
; Bahram Mobasher
; Jeffrey A. Newman
; Marc Rafelski
; Vithal Tilvi
; S. P. Willner
; | Date: |
20 Oct 2014 | Abstract: | We present a robust measurement and analysis of the rest-frame ultraviolet
(UV) luminosity function at z=4-8. We use deep Hubble Space Telescope imaging
over the CANDELS/GOODS fields, the Hubble Ultra Deep Field and the Year 1
Hubble Frontier Field deep parallel observations. These surveys provides an
effective volume of 0.6-1.2 x 10^6 Mpc^3 over this epoch, allowing us to
perform a robust search for bright (M_UV < -21) and faint (M_UV=-18) galaxies.
We select galaxies using a well-tested photometric redshift technique with
careful screening of contaminants, finding a sample of 7446 galaxies at
3.5<z<8.5, with >1000 galaxies at z~6-8. We measure the luminosity function
using a Markov Chain Monte Carlo analysis to measure robust uncertainties. At
the faint end our results agree with previous studies, yet we find a higher
abundance of UV-bright galaxies at z>6, with M* ~ -21 at z>5, different than
that inferred based on previous trends at lower redshift. At z=8, a single
power-law provides an equally good fit to the UV luminosity function, while at
z=6 and 7, an exponential cutoff at the bright-end is moderately preferred. We
compare to semi-analytical models, and find that the lack of evolution in M* is
consistent with models where the impact of dust attenuation on the bright-end
of the luminosity function decreases at higher redshift. We measure the
evolution of the cosmic star-formation rate density, correcting for dust
attenuation, and find that it declines as (1+z)^(-4.3 +/- 0.5) at z>4,
consistent with observations at z>9. Our observations are consistent with a
reionization history that starts at z>10, completes at z>6, and reaches a
midpoint (x_HII = 0.5) at 6.7<z<9.4. Finally, our observations predict that the
abundance of bright z=9 galaxies is likely higher than previous constraints,
though consistent with recent estimates of bright z~10 galaxies. [abridged] | Source: | arXiv, 1410.5439 | Services: | Forum | Review | PDF | Favorites |
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