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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709923.0, MPI für Astronomie / Publikationen_mpia
An ALMA Survey of Sub-millimeter Galaxies in the Extended Chandra Deep Field South: Sub-millimeter properties of color-selected galaxies
Authors:Decarli, R.; Smail, I.; Walter, F.; Swinbank, A. M.; Chapman, S.; Coppin, K. E. K.; Cox, P.; Dannerbauer, H.; Greve, T. R.; Hodge, J. A.; Ivison, R.; Karim, A.; Knudsen, K. K.; Lindroos, L.; Rix, H. -. W.; Schinnerer, E.; Simpson, J. M.; van der Werf, P.; Weiß, A.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 115 (12 pp)
Audience:Not Specified
Abstract / Description:We study the sub-millimeter properties of color-selected galaxies via a stacking analysis applied for the first time to interferometric data at sub-millimeter wavelengths. We base our study on 344 GHz ALMA continuum observations of ~20''-wide fields centered on 86 sub-millimeter sources detected in the LABOCA Extended Chandra Deep Field South (ECDFS) Sub-millimeter Survey. We select various classes of galaxies (K-selected, star-forming sBzK galaxies, extremely red objects, and distant red galaxies) according to their optical/near-infrared fluxes. We find clear, >10sigma detections in the stacked images of all these galaxy classes. We include in our stacking analysis Herschel/SPIRE data to constrain the dust spectral energy distribution of these galaxies. We find that their dust emission is well described by a modified blackbody with T dust ≈ 30 K and beta = 1.6 and infrared luminosities of (5-11) × 1011 L &sun; or implied star formation rates of 75-140 M &sun; yr-1. We compare our results with those of previous studies based on single-dish observations at 870 mum and find that our flux densities are a factor 2-3 higher than previous estimates. The discrepancy is observed also after removing sources individually detected in ALESS maps. We report a similar discrepancy by repeating our analysis on 1.4 GHz observations of the whole ECDFS. Hence, we find tentative evidence that galaxies that are associated in projected and redshift space with sub-mm bright sources are brighter than the average population. Finally, we put our findings in the context of the cosmic star formation rate density as a function of redshift.
Free Keywords:galaxies: high-redshift; galaxies: star formation; submillimeter: galaxies; techniques: interferometric
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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