A Substantial Population of Massive Quiescent Galaxies at z ~ 4 from ZFOURGE
Papovich, Casey; Dickinson, Mark; Inami, Hanae; Kelson, Daniel D.; Kacprzak, Glenn G.; Glazebrook, Karl; Labbé, Ivo; Tran, Kim-Vy H.; Spitler, Lee R.; Quadri, Ryan; Straatman, Caroline M. S.; Tilvi, Vithal; van Dokkum, Pieter; McCarthy, Patrick J.; Brammer, Gabriel B.; Allen, Rebecca; Persson, S. Eric; Tomczak, Adam; Mehrtens, Nicola; Murphy, David; Rees, Glen; Altieri, Bruno; Monson, Andy; Kawinwanichakij, Lalit
Netherlands, Australia, Spain, Chile, United States, France
Abstract
We report the likely identification of a substantial population of massive M ~ 1011 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/4000 Å breaks, relatively old stellar populations, large stellar masses, and low SFRs, with a median specific SFR of 2.9 ± 1.8 × 10-11 yr-1. Ultradeep Herschel/PACS 100 μm, 160 μm and Spitzer/MIPS 24 μm data reveal no dust-obscured SFR activity for 15/19(79%) galaxies. Two far-IR detected galaxies are obscured QSOs. Stacking the far-IR undetected galaxies yields no detection, consistent with the spectral energy distribution fit, indicating independently that the average specific SFR is at least 10 × smaller than that of typical star-forming galaxies at z ~ 4. Assuming all far-IR undetected galaxies are indeed quiescent, the volume density is 1.8 ± 0.7 × 10-5 Mpc-3 to a limit of log10 M/M ⊙ >= 10.6, which is 10 × and 80 × lower than at z = 2 and z = 0.1. They comprise a remarkably high fraction (~35%) of z ~ 4 massive galaxies, suggesting that suppression of star formation was efficient even at very high redshift. Given the average stellar age of 0.8 Gyr and stellar mass of 0.8 × 1011 M ⊙, the galaxies likely started forming stars before z = 5, with SFRs well in excess of 100 M ⊙ yr-1, far exceeding that of similarly abundant UV-bright galaxies at z >= 4. This suggests that most of the star formation in the progenitors of quiescent z ~ 4 galaxies was obscured by dust.
This Letter contains data gathered with the 6.5 m Magellan Telescopes located at Las Campanas Observatory, Chile.