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arXiv · 1007.1902

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

H. Dannerbauer·E. Daddi·G. E. Morrison·B. Altieri·P. Andreani·H. Aussel·S. Berta·A. Bongiovanni·A. Cava·J. Cepa·A. Cimatti·H. Dominguez·D. Elbaz·N. Forster Schreiber·R. Genzel·C. Gruppioni·B. Horeau·H. S. Hwang·E. Le Floc'h·J. Le Pennec·D. Lutz·G. Magdis·B. Magnelli·R. Maiolino·R. Nordon·A. M. Perez Garcia·A. Poglitsch·P. Popesso·F. Pozzi·L. Riguccini·G. Rodighiero·A. Saintonge·P. Santini·M. Sanchez-Portal·L. Shao·E. Sturm·L. Tacconi·I. Valtchanov
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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.

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H. Dannerbauer, E. Daddi, G. E. Morrison, B. Altieri, P. Andreani, H. Aussel, S. Berta, A. Bongiovanni, A. Cava, J. Cepa, A. Cimatti, H. Dominguez, D. Elbaz, N. Forster Schreiber, R. Genzel, C. Gruppioni, B. Horeau, H. S. Hwang, E. Le Floc'h, J. Le Pennec, D. Lutz, G. Magdis, B. Magnelli, R. Maiolino, R. Nordon, A. M. Perez Garcia, A. Poglitsch, P. Popesso, F. Pozzi, L. Riguccini, G. Rodighiero, A. Saintonge, P. Santini, M. Sanchez-Portal, L. Shao, E. Sturm, L. Tacconi, I. Valtchanov. 2010-07-12. Unveiling Far-Infrared Counterparts of Bright Submillimeter Galaxies Using PACS Imaging. https://doi.org/10.1088/2041-8205%2F720%2F2%2Fl144

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