http://arxiv.org/abs/1506.08249
We present the results of a 135-arcmin$^2$ search for high-redshift galaxies lensed by clusters from the MAssive Cluster Survey. We use relatively shallow images obtained with the Hubble Space Telescope in four passbands, namely, F606W, F814W, F110W, and F140W. We identify 124 F814W dropouts as candidates for galaxies at $z \ge 6$. In order to fit the available broad-band photometry to galaxy spectral energy distribution templates, we develop a prior for the level of dust extinction at various redshifts. We also investigate the systematic biases incurred by the use of SED-fit software. The fits we obtain yield an estimate of 27 Lyman-break galaxies with photometric redshifts from $z \sim 7$ to 9. In addition, our survey has identified over 70 candidates with a significant probability of being lower-redshift ($z \sim 2$) interlopers. We conclude that even as few as four broad-band filters — when combined with fitting the SEDs — are capable of isolating promising objects. Such surveys are thus ideal both for investigating the bright end ($M_{1500} \le -19$) of the high-redshift UV luminosity function and for identifying candidate massive evolved galaxies at lower redshifts.
A. Repp, H. Ebeling and J. Richard
Tue, 30 Jun 15
11/75
Comments: 12 pages, 7 figures, 4 tables
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