UNVEILING FAR-INFRARED COUNTERPARTS OF BRIGHT SUBMILLIMETER GALAXIES USING PACS IMAGING

Journal Article · Fri Sep 10 04:00:00 EDT 2010 · Astrophysical Journal Letters

DOI:https://doi.org/10.1088/2041-8205/720/2/L144· OSTI ID:21452827

Dannerbauer, H; Daddi, E; Aussel, H; Elbaz, D; Horeau, B; Hwang, H S; Le Floc'h, E; Le Pennec, J ^[1]; Morrison, G E ^[2]; Altieri, B ^[3]; Andreani, P ^[4]; Berta, S; Schreiber, N Foerster; Genzel, R ^[5]; Bongiovanni, A; Cava, A; Cepa, J ^[6]; Cimatti, A ^[7]; Dominguez, H; Gruppioni, C ^[8]

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1. Laboratoire AIM, CEA/DSM-CNRS-Universite Paris Diderot, DAPNIA/Service d'Astrophysique, CEA Saclay, Orme des Merisiers, F-91191 Gif-sur-Yvette Cedex (France)
2. Institute for Astronomy, University of Hawaii, Manoa, HI 96822 (United States)
3. Herschel Science Centre, European Space Astronomy Centre, ESA, Villanueva de la Canada, 28691 Madrid (Spain)
4. ESO, Karl-Schwarzschild-Str. 2, D-85748 Garching (Germany)
5. Max-Planck-Institut fuer Extraterrestrische Physik (MPE), Postfach 1312, 85741 Garching (Germany)
6. Instituto de Astrofisica de Canarias, 38205 La Laguna (Spain)
7. Dipartimento di Astronomia, Universita di Bologna, Via Ranzani 1, 40127 Bologna (Italy)
8. INAF-Osservatorio Astronomico di Bologna, via Ranzani 1, I-40127 Bologna (Italy)

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 (SMGs, 39%) with a signal-to-noise ratio of {>=}3 at 100 {mu}m down to 3.0 mJy, and/or at 160 {mu}m down to 5.7 mJy. The fraction of SMGs seen at 160 {mu}m is higher than that at 100 {mu}m. 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 submillimeter/millimeter 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 the Very Large Array 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.

• OSTI ID: 21452827
• Journal Information: Astrophysical Journal Letters, Journal Name: Astrophysical Journal Letters Journal Issue: 2 Vol. 720; ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
COSMOLOGY
DIMENSIONLESS NUMBERS
DUSTS
ENERGY SPECTRA
GALAXIES
RED SHIFT
SIGNAL-TO-NOISE RATIO
SPECTRA
WAVELENGTHS