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29 March 2024
 
  » arxiv » 1211.2230

 Article overview


A Census of Star-Forming Galaxies in the z~9-10 Universe based on HST+Spitzer Observations Over 19 CLASH clusters: Three Candidate z~9-10 Galaxies and Improved Constraints on the Star Formation Rate Density at z~9.2
R. Bouwens ; L. Bradley ; A. Zitrin ; D. Coe ; M. Franx ; W. Zheng ; R. Smit ; O. Host ; M. Postman ; L. Moustakas ; I. Labbe ; M. Carrasco ; A. Molino ; M. Donahue ; D. D. Kelson ; M. Meneghetti ; S. Jha ; N. Benitez ; D. Lemze ; K. Umetsu ; T. Broadhurst ; J. Moustakas ; P. Rosati ; M. Bartelmann ; H. Ford ; G. Graves ; C. Grillo ; L. Infante ; Y. Jiminez-Teja ; S. Jouvel ; O. Lahav ; D. Maoz ; E. Medezinski ; P. Melchior ; J. Merten ; M. Nonino ; S. Ogaz ; S. Seitz ;
Date 12 Nov 2012
AbstractWe utilise a two-color Lyman-break selection criterion to search for z~9-10 galaxies over the first 19 clusters in the CLASH program. Key to this search are deep observations in five near-IR passbands to 1.6 microns, allowing us good constraints on the position of the Lyman break to z~10. A systematic search yields three z~9-10 candidates in total above a 6 sigma detection limit. While we have already reported on the most robust of these candidates, two new z~9 candidates (H~26.2-26.9) are also revealed in our expanded search. The observed H-IRAC colors for the sources are sufficiently blue to strongly favor redshifts of z>~9 for these sources. A careful assessment of various sources of contamination suggests <~1 contaminants for our z~9-10 selection. To determine the implications of these search results for the LF and SFR density at z~9, we introduce a new differential approach to deriving these quantities in lensing fields. Our procedure is to derive the evolution by comparing the number of z~9-10 galaxy candidates found in CLASH with the number of galaxies in a slightly lower redshift sample (after correcting for the difference in selection volumes), here taken to be z~8. This procedure takes advantage of the fact that the relative selection volumes available for the z~8 and z~9-10 selections behind lensing clusters are not greatly dependent on the details of the gravitational lensing models. We find that the normalization of the UV LF at z~9 is just 0.22(-0.15)(+0.30)x that at z~8, ~2x lower than what we would infer extrapolating z~4-8 LF results. These results therefore suggest a more rapid evolution in the UV LF at z>8 than seen at lower redshifts. Compared to similar evolutionary findings from the HUDF, our result is much more insensitive to large-scale structure uncertainties, given our many independent sightlines on the high-redshift universe.
Source arXiv, 1211.2230
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