Journal
ASTROPHYSICAL JOURNAL
Volume 789, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/789/1/12
Keywords
cosmology: observations; galaxies: formation; galaxies: starburst; gravitational lensing: strong; submillimeter: galaxies
Categories
Funding
- NSF [AST-0709356, AST-1313309, AST-1313150]
- University of Wisconsin Research Committee
- Wisconsin Alumni Research Foundation
- David and Lucile Packard Foundation
- National Science Council of Taiwan [102-2119-M-001-007-MY3]
- STFC [ST/I001573/1, ST/L00075X/1] Funding Source: UKRI
- Science and Technology Facilities Council [ST/I001573/1, ST/L00075X/1] Funding Source: researchfish
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [1313150, 1313309] Funding Source: National Science Foundation
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We obtained Submillimeter Array (SMA) observations of eight faint (intrinsic 850 mu m fluxes < 2 mJy) submillimeter galaxies (SMGs) discovered in SCUBA images of the massive lensing cluster fields A370, A2390, and A 1689 and detected five. In total, we obtain five SMA detections, all of which have de-lensed fluxes <1 mJy with estimated total infrared luminosities 10(10)-10(12) L-circle dot, comparable to luminous infrared galaxies and normal star-forming galaxies. Based on the latest number counts, these galaxies contribute similar to 70% of the 850 mu m extragalactic background light and represent the dominant star-forming galaxy population in the dusty universe. However, only 40(-16)(+30)% 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 greater than or similar to 3) or extremely dusty, and they are not included in current star formation history estimates.
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