SMA Observations on faint submillimeter galaxies with S 850 < 2 mJy : ultra dusty low-luminosity galaxies at high redshift.

Chen, C.C
Cowie, L.L.
Barger, A.J.
Wang, W.-H.
Williams, J.P.

Open PDF

Open link

Publication date

June 2014

DOI

10.1088/0004-637X/789/1/12

Publisher

IOP Publishing

ISSN

0004-637X

Journal

The Astrophysical Journal

Language

English

Abstract

We obtained Submillimeter Array (SMA) observations of eight faint (intrinsic 850 μm fluxes < 2 mJy) submillimeter galaxies (SMGs) discovered in SCUBA images of the massive lensing cluster fields A370, A2390, and A1689 and detected five. In total, we obtain five SMA detections, all of which have de-lensed fluxes <1 mJy with estimated total infrared luminosities 1010-1012 L ☉, comparable to luminous infrared galaxies and normal star-forming galaxies. Based on the latest number counts, these galaxies contribute ~70% of the 850 μm extragalactic background light and represent the dominant star-forming galaxy population in the dusty universe. However, only 40$^{+30}_{-16}$% of our faint SMGs would be detected in deep optical or near-infrared surv...