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25 April 2024 |
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Spitzer UltRa Faint SUrvey Program (SURFS UP). II. IRAC-Detected Lyman-Break Galaxies at 6 < z < 10 Behind Strong-Lensing Clusters | | Kuang-Han Huang
; Maruša Bradač
; Brian C. Lemaux
; R. E. Ryan, Jr.
; Austin Hoag
; Marco Castellano
; Ricardo AmorÍn
; Adriano Fontana
; Gabriel B. Brammer
; Benjamin Cain
; L. M. Lubin
; Emiliano Merlin
; Kasper B. Schmidt
; Tim Schrabback
; Tommaso Treu
; Anthony H. Gonzalez
; Anja Von Der Linden
; Robert I. Knight
; | | Date: |
8 Apr 2015 | | Abstract: | We study the stellar population properties of the IRAC-detected $6 lesssim z
lesssim 10$ galaxy candidates from the Spitzer UltRa Faint SUrvey Program
(SURFS UP). Using the Lyman Break selection technique, we find a total of 16
new galaxy candidates at $6 lesssim z lesssim 10$ with $S/N geq 3$ in at
least one of the IRAC $3.6mu$m and $4.5mu$m bands. According to the best mass
models available for the surveyed galaxy clusters, these IRAC-detected galaxy
candidates are magnified by factors of $sim 1.2$--$5.5$. We find that the
IRAC-detected $6 lesssim z lesssim 10$ sample is likely not a homogeneous
galaxy population: some are relatively massive (stellar mass as high as $4
imes 10^9,M_{odot}$) and evolved (age $lesssim 500$ Myr) galaxies, while
others are less massive ($M_{ ext{stellar}}sim 10^8,M_{odot}$) and very
young ($sim 10$ Myr) galaxies with strong nebular emission lines that boost
their rest-frame optical fluxes. We identify two Ly$alpha$ emitters in our
sample from the Keck DEIMOS spectra, one at $z_{ ext{Ly}alpha}=6.76$ (in
RXJ1347) and one at $z_{ ext{Ly}alpha}=6.32$ (in MACS0454). We show that IRAC
$[3.6]-[4.5]$ color, when combined with photometric redshift, can be used to
identify galaxies likely with strong nebular emission lines within certain
redshift windows. | | Source: | arXiv, 1504.2099 | | Services: | Forum | Review | PDF | Favorites | |
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