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…
By R. Bouwens, L. Bradley, A. Zitrin, D. Coe, M. Franx, Wei Zheng, R. Smit, O. Høst, M. Postman, L. A. Moustakas and 27 more. 2012
162 citations recorded by the source corpus.
We utilize a two-color Lyman-break selection criterion to search for z ∼ 9–10 galaxies over the first 19 clusters in the CLASH program. A systematic search yields three z ∼ 9–10 candidates. While we have already reported the most robust of these candidates, MACS1149-JD, two additional z ∼ 9 candidates are also found and have H160-band magnitudes of ∼26.2–26.9. 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 luminosity function (LF) and star formation rate 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 differences in selection volumes), here taken to be z ∼ 8. This procedure takes advantage of the fact that the relative volumes available for the z ∼ 8 and z ∼ 9–10 selections behind lensing clusters are not greatly dependent on the details of the lensing models. We find that the normalization of the UV LF at z ∼ 9 is just that at z ∼ 8, which is ∼1.4× lower than extrapolating z ∼ 4–8 LF results. While consistent with the evolution in the UV LF seen at z ∼ 4–8, these results marginally favor a more rapid evolution at z > 8. Compared to similar evolutionary findings from the HUDF, our result is less insensitive to large-scale structure uncertainties, given our many independent sightlines on the high-redshift universe.
Subfields: Astronomy and Astrophysics, Instrumentation
View Paper: https://www.semanticscholar.org/paper/ba76a29878a4d7ce14d39d8050a7c67502ece2cf
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Citations in the corpus
- UV LUMINOSITY FUNCTIONS AT REDSHIFTS z ∼ 4 TO z ∼ 10: 10,000 GALAXIES FROM HST LEGACY FIELDS (2014, methodology): “However, as subsequent research has shown (Wilkins et al. 2011; Bouwens et al. 2012, 2013; Finkelstein et al. 2012; Willott et al. 2013; Rogers et al. 2013), the most luminous z ∼ 6 galaxies have moderately red UV -continuum slopes β ∼ −1.5.”
- ALMA SPECTROSCOPIC SURVEY IN THE HUBBLE ULTRA DEEP FIELD: THE INFRARED EXCESS OF UV-SELECTED z = 2–10 GALAXIES AS A FUNCTION OF UV-CONTINUUM SLOPE AND STELLAR MASS (2016, methodology): “The β value we utilize here is motivated by the results of Bouwens et al. (2012), Finkelstein et al. (2012), Bouwens et al. (2014), Kurczynski et al. (2014), and Wilkins et al. (2016a) who find evidence for bluer slopes for higher redshift and generally fainter, lower-mass galaxies. prescriptions…”
- The z ∼ 6 Luminosity Function Fainter than −15 mag from the Hubble Frontier Fields: The Impact of Magnification Uncertainties (2016, background): “…adopt a median value of −2.2 for the UV -continuum slope for galaxies in our simulations to match that found in the observations (e.g., Bouwens et al. 2014: see also Wilkins et al. 2011; Bouwens et al. 2012; Finkelstein et al. 2012; Dunlop et al. 2013; Rogers et al. 2014; Duncan & Conselice 2015).”