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.

doi:10.1088/0004-637x/789/1/12

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.

Authors

C.C Chen

L.L. Cowie

A.J. Barger

W.-H. Wang

J.P. Williams

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 surveys, which suggests many of these sources are at high redshifts (z gsim 3) or extremely dusty, and they are not included in current star formation history estimates.

Citation

Chen, C., Cowie, L., Barger, A., Wang, W., & Williams, J. (2014). SMA Observations on faint submillimeter galaxies with S 850 < 2 mJy: ultra dusty low-luminosity galaxies at high redshift. Astrophysical Journal, 789(1), https://doi.org/10.1088/0004-637x/789/1/12

Journal Article Type	Article
Publication Date	Jun 1, 2014
Deposit Date	Oct 3, 2014
Publicly Available Date	Oct 10, 2014
Journal	Astrophysical Journal
Print ISSN	0004-637X
Electronic ISSN	1538-4357
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	789
Issue	1
DOI	https://doi.org/10.1088/0004-637x/789/1/12
Keywords	Cosmology: observations, Galaxies: formation, Galaxies: starburst, Gravitational lensing: strong, Submillimeter: galaxies.