A LABOCA SURVEY OF THE EXTENDED CHANDRA DEEP FIELD SOUTH-SUBMILLIMETER PROPERTIES OF NEAR-INFRARED SELECTED GALAXIES
- Max-Planck-Institut fuer Astronomie, 69117 Heidelberg (Germany)
- Max-Planck-Institut fuer Radioastronomie, D-53121 Bonn (Germany)
- Institute for Computational Cosmology, Durham University, Durham DH1 6BH (United Kingdom)
- Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210008 (China)
- Argelander Institute for Astronomy, University of Bonn, 53121 Bonn (Germany)
- European Southern Observatory, Garching (Germany)
- National Optical Astronomical Observatory, Tucson, AZ 85719 (United States)
- Department of Astronomy, Yale University, New Haven, CT (United States)
- Max-Planck-Institut fuer extraterrestrische Physik, 85741 Garching (Germany)
- Pennsylvania State University, Astronomy and Astrophysics 525 Davey Lab, University Park, PA 16802 (United States)
Using the 330 hr ESO-MPG 870 {mu}m survey of the Extended Chandra Deep Field South (ECDF-S) obtained with the Large Apex BOlometer CAmera (LABOCA) on the Atacama Pathfinder EXperiment (APEX), we have carried out a stacking analysis at submillimeter (submm) wavelengths of a sample of 8266 near-infra-red (near-IR) selected (K {sub vega} {<=} 20) galaxies, including 893 BzK galaxies, 1253 extremely red objects (EROs), and 737 distant red galaxies (DRGs), selected from the Multi-wavelength Survey by Yale-Chile (MUSYC). We measure average 870 {mu}m fluxes of 0.22 {+-} 0.01 mJy (22.0{sigma}), 0.48 {+-} 0.04 mJy (12.0{sigma}), 0.39 {+-} 0.03 mJy (13.0{sigma}), and 0.43 {+-} 0.04 mJy (10.8{sigma}) for the K {sub vega} {<=} 20, BzK, ERO, and DRG samples, respectively. For the BzK, ERO, and DRG sub-samples, which overlap to some degree and are likely to be at z {approx_equal} 1-2, this implies an average far-IR luminosity of {approx}(1-5) x 10{sup 11} L{sub sun} and star formation rate (SFR) of {approx}20-90 M{sub sun} . Splitting the BzK galaxies into star-forming (sBzK) and passive (pBzK) galaxies, the former is significantly detected (0.50 {+-} 0.04 mJy, 12.5{sigma}) while the latter is only marginally detected (0.34 {+-} 0.10 mJy, 3.4{sigma}), thus confirming that the sBzK and pBzK criteria to some extent select obscured, star-forming, and truly passive galaxies, respectively. The K {sub vega} {<=} 20 galaxies are found to contribute 7.27 {+-} 0.34 Jy deg{sup -2} (16.5% {+-} 5.7%) to the 870 {mu}m extragalactic background light (EBL). sBzK and pBzK galaxies contribute 1.49 {+-} 0.22 Jy deg{sup -2} (3.4% {+-} 1.3%) and 0.20 {+-} 0.14 Jy deg{sup -2} (0.5% {+-} 0.3%) to the EBL. We present the first delineation of the average submm signal from the K {sub vega} {<=} 20 selected galaxies and their contribution to the submm EBL as a function of (photometric) redshift, and find a decline in the average submm signal (and therefore IR luminosity and SFR) by a factor {approx}2-3 from z {approx} 2 to z {approx} 0. This is in line with a cosmic star formation history in which the star formation activity in galaxies increases significantly at z {approx}> 1. A linear correlation between the average 24 {mu}m and 870 {mu}m flux densities is found for the K {sub vega} {<=} 20 galaxies with 24 {mu}m fluxes {approx}<350 {mu}Jy (corresponding to L {sub IR} {approx_equal} 1.5 x 10{sup 12} L{sub sun} at z {approx_equal} 2), while at higher 24 {mu}m fluxes there is no correlation. This behavior suggests that star formation, and not active galactic nuclei (AGNs), is in general responsible for the bulk of the mid-IR emission of L {sub IR} {approx}< 1.5 x 10{sup 12} L{sub sun} systems, while in more luminous systems the AGN makes a significant contribution to the 24 {mu}m emission. By mapping the stacked 870 {mu}m signal across the B - z versus z - K diagram we have confirmed the ability of the sBzK selection criterion to select star-forming galaxies at z > 1, although our analysis suggests that the subset of sBzK galaxies which are also EROs are responsible for >80% of the submm emission from the entire sBzK population.
- OSTI ID:
- 21454994
- Journal Information:
- Astrophysical Journal, Vol. 719, Issue 1; Other Information: DOI: 10.1088/0004-637X/719/1/483; ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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