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Straatman, Caroline M S; Labbe, Ivo; Spitler, Lee R; Allen, Rebecca; Altieri, Bruno; Brammer, Gabriel B; Dickinson, Mark; van Dokkum, Pieter; Inami, Hanae; Glazebrook, Karl
Astrophysical journal. Letters, 03/2014, Letnik: 783, Številka: 1Journal Article
We report the likely identification of a substantial population of massive M ~ 10sup 11 M galaxies at z ~ 4 with suppressed star formation rates (SFRs), selected on rest-frame optical to near-IR colors from the FourStar Galaxy Evolution Survey (ZFOURGE). The observed spectral energy distributions show pronounced breaks, sampled by a set of near-IR medium-bandwidth filters, resulting in tightly constrained photometric redshifts. Fitting stellar population models suggests large Balmer/4000A breaks, relatively old stellar populations, large stellar masses, and low SFRs, with a median specific SFR of 2.9 + or -1.8 10sup -11 yrsup -1. Ultradeep Herschel/PACS 100 mu m, 160 mu m and Spitzer/MIPS 24 mu m data reveal no dust-obscured SFR activity for 15/19(79%) galaxies. The study suggests that most of the star formation in the progenitors of quiescent z ~ 4 galaxies was obscured by dust.
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