Unveiling Far-Infrared Counterparts of Bright Submillimeter Galaxies Using PACS Imaging

Abstract

We present a search for Herschel-PACS counterparts of dust-obscured, high-redshift objects previously selected at submillimeter and millimeter wavelengths in the Great Observatories Origins Deep Survey North field. We detect 22 of 56 submillimeter galaxies (39%) with a SNR of >=3 at 100 micron down to 3.0 mJy, and/or at 160 micron down to 5.7 mJy. The fraction of SMGs seen at 160 micron is higher than that at 100 micron. About 50% of radio-identified SMGs are associated with PACS sources. We find a trend between the SCUBA/PACS flux ratio and redshift, suggesting that these flux ratios could be used as a coarse redshift indicator. PACS undetected submm/mm selected sources tend to lie at higher redshifts than the PACS detected ones. A total of 12 sources (21% of our SMG sample) remain unidentified and the fact that they are blank fields at Herschel-PACS and VLA 20 cm wavelength may imply higher redshifts for them than for the average SMG population (e.g., z>3-4). The Herschel-PACS imaging of these dust-obscured starbursts at high-redshifts suggests that their far-infrared spectral energy distributions have significantly different shapes than template libraries of local infrared galaxies.

6 pages, 4 figures. ApJ Letters in press

References in corpus (13)

• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
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Cited by in corpus (14)

• PACS Evolutionary Probe (PEP) - A Herschel Key Program
• A Herschel view of the far-infrared properties of submillimetre galaxies
• The LABOCA survey of the Extended Chandra Deep Field South: A photometric redshift survey of submillimetre galaxies
• What Does a Submillimeter Galaxy Selection Actually Select? The Dependence of Submillimeter Flux Density on Star Formation Rate and Dust Mass
• GOODS-Herschel: Impact of Active Galactic Nuclei and Star Formation Activity on Infrared Spectral Energy Distributions at High Redshift
• An excess of dusty starbursts related to the Spiderweb galaxy
• Precise Identifications of Submillimeter Galaxies: Measuring the History of Massive Star-Forming Galaxies to z>5
• The Herschel Multi-Tiered Extragalactic Survey: SPIRE-mm Photometric Redshifts
• Far-infrared surveys of galaxy evolution
• GOODS-Herschel A population of 24micron dropout sources at z < 2
• Herschel-ATLAS and ALMA: HATLAS J142935.3-002836, a lensed major merger at redshift 1.027
• Herschel Detection of Dust Emission from UV-Luminous Star-Forming Galaxies at 3.3<z<4.3
• AzTEC half square degree survey of the SHADES fields - II. Identifications, redshifts, and evidence for large-scale structure
• The LABOCA/ACT Survey of Clusters at All Redshifts: multi-wavelength analysis of background submillimeter galaxies