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We present a search for Herschel-PACS counterparts of dust-obscured,high-redshift objects previously selected at submillimeter and millimeterwavelengths in the Great Observatories Origins Deep Survey North field. Wedetect 22 of 56 submillimeter galaxies (39%) with a SNR of >=3 at 100 microndown to 3.0 mJy, and/or at 160 micron down to 5.7 mJy. The fraction of SMGsseen at 160 micron is higher than that at 100 micron. About 50% ofradio-identified SMGs are associated with PACS sources. We find a trend betweenthe SCUBA/PACS flux ratio and redshift, suggesting that these flux ratios couldbe used as a coarse redshift indicator. PACS undetected submm/mm selectedsources tend to lie at higher redshifts than the PACS detected ones. A total of12 sources (21% of our SMG sample) remain unidentified and the fact that theyare blank fields at Herschel-PACS and VLA 20 cm wavelength may imply higherredshifts for them than for the average SMG population (e.g., z>3-4). TheHerschel-PACS imaging of these dust-obscured starbursts at high-redshiftssuggests that their far-infrared spectral energy distributions havesignificantly different shapes than template libraries of local infraredgalaxies.

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