CPL - Chalmers Publication Library
| Utbildning | Forskning | Styrkeområden | Om Chalmers | In English In English Ej inloggad.

An Alma Survey of Sub-Millimeter Galaxies in the Extended Chandra Deep Field South: Sub-Millimeter Properties of Color-Selected Galaxies

R. Decarli ; I. Smail ; F. Walter ; A. M. Swinbank ; S. Chapman ; K. E. K. Coppin ; P. Cox ; H. Dannerbauer ; T. R. Greve ; J. A. Hodge ; R. Ivison ; A. Karim ; Kirsten Kraiberg Knudsen (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; Lukas Lindroos (Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik) ; H. W. Rix ; E. Schinnerer ; J. M. Simpson ; P. van der Werf ; A. Weiss
Astrophysical Journal (0004-637X). Vol. 780 (2014), 2,
[Artikel, refereegranskad vetenskaplig]

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 similar to 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, >10 sigma 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 approximate to 30 K and beta = 1.6 and infrared luminosities of (5-11) x 10(11) L-circle dot or implied star formation rates of 75-140 M-circle dot yr(-1). We compare our results with those of previous studies based on single-dish observations at 870 mu m 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.

Nyckelord: high-redshift, galaxies, star formation

Denna post skapades 2014-02-14. Senast ändrad 2015-01-19.
CPL Pubid: 193789


Läs direkt!

Lokal fulltext (fritt tillgänglig)

Länk till annan sajt (kan kräva inloggning)

Institutioner (Chalmers)

Institutionen för rymd- och geovetenskap, Radioastronomi och astrofysik (2010-2017)


Astronomi, astrofysik och kosmologi

Chalmers infrastruktur

Relaterade publikationer

Denna publikation ingår i:

Stacking of interferometric data at sub-millimeter and radio wavelengths