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CLASH: A Census of Magnified Star-Forming Galaxies at z ~ 6-8 | L.D. Bradley
; A. Zitrin
; D. Coe
; R. Bouwens
; M. Postman
; I. Balestra
; C. Grillo
; A. Monna
; P. Rosati
; S. Seitz
; O. Host
; D. Lemze
; J. Moustakas
; L.A. Moustakas
; X. Shu
; W. Zheng
; T. Broadhurst
; M. Carrasco
; S. Jouvel
; A. Koekemoer
; E.. Medezinski
; M. Meneghetti
; M. Nonino
; R. Smit
; K. Umetsu
; M. Bartelmann
; N. Benitez
; M. Donahue
; H. Ford
; L. Infante
; Y. Jimenez-Teja
; D. Kelson
; O. Lahav
; D. Maoz
; P. Melchior
; J. Merten
; A. Molino
; | Date: |
7 Aug 2013 | Abstract: | We utilize 16-band Hubble Space Telescope (HST) observations of 18 lensing
clusters obtained as part of the Cluster Lensing And Supernova survey with
Hubble (CLASH) Multi-Cycle Treasury program to search for z~6-8 galaxies. We
report the discovery of 206, 45, and 13 Lyman-break galaxy (LBG) candidates at
z~6, z~7, and z~8, respectively, identified from purely photometric redshift
selections. This large sample, representing nearly an order of magnitude
increase in the number of magnified star-forming galaxies at z~6-8 presented to
date, is unique in that we have observations in four WFC3/UVIS UV, seven
ACS/WFC optical and all five WFC3/IR broad-band filters, which enable very
accurate photometric redshift selections. We construct detailed lensing models
for all 18 clusters (although some are preliminary) to estimate object
magnifications and to identify two new multiply-lensed z >~ 6 candidates. The
median magnifications for these 18 clusters are 4, 4, and 5 for the z~6, z~7,
and z~8 samples, respectively, over an average area of 4.5 arcmin^2 per
cluster. We compare our observed number counts with expectations based on
convolving "blank" field UV luminosity functions through our cluster lens
models and find agreement down to ~27 mag, where we begin to suffer significant
incompleteness. In all three redshift bins we find a higher number density at
brighter observed magnitudes than the field predictions, in excellent agreement
with the lensed expectations and clearly demonstrating the enhanced efficiency
of lensing clusters over field surveys. Once again, lensing clusters appear to
be a powerful tool in the discovery and study of high-redshift galaxies and
allow for the first glimpse of faint galaxies beyond the reach of the deepest
HST legacy field surveys, a technique that will continue be exploited with the
upcoming ultradeep Hubble Frontier Fields campaign. | Source: | arXiv, 1308.1692 | Services: | Forum | Review | PDF | Favorites |
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