ALMA 26 arcmin2 Survey of GOODS-S at 1 mm (ASAGAO): Near-infrared-dark Faint ALMA Sources
Caputi, Karina I.
Dunlop, James S.
Hayatsu, Natsuki H.
Ivison, Rob J.
Yun, Min S.
AffiliationUniv Arizona, Steward Observ
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PublisherIOP PUBLISHING LTD
CitationYamaguchi, Y., Kohno, K., Hatsukade, B., Wang, T., Yoshimura, Y., Ao, Y., ... & Fujimoto, S. (2019). ALMA 26 arcmin2 Survey of GOODS-S at 1 mm (ASAGAO): Near-infrared-dark Faint ALMA Sources. The Astrophysical Journal, 878(1), 73.
Rights© 2019. The American Astronomical Society. All rights reserved.
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AbstractWe report detections of two 1.2 mm continuum sources (S-1.2 mm similar to 0.6 mJy) without any counterparts in the deep H- and/or K-band image (i.e., K-band magnitude greater than or similar to 26 mag). These near-infrared-dark faint millimeter sources are uncovered by ASAGAO, a deep and wide-field (similar or equal to 26 arcmin(2)) Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm survey. One has a red IRAC (3.6 and 4.5 mu m) counterpart, and the other has been independently detected at 850 and 870 mu m using SCUBA2 and ALMA Band 7, respectively. Their optical-to-radio spectral energy distributions indicate that they can lie at z greater than or similar to 3-5 and can be in the early phase of massive galaxy formation. Their contribution to the cosmic star formation rate density is estimated to be similar to 1 x 10(-3) M-circle dot yr(-1) Mpc(-3) if they lie somewhere in the redshift range of z similar to 3-5. This value can be consistent with, or greater than, that of bright submillimeter galaxies (S-870 mu m > 4.2 mJy) at z similar to 3-5. We also uncover three more candidate near-infrared-dark faint ALMA sources without any counterparts (S-1.2 mm similar to 0.45-0.86 mJy). These results show that an unbiased ALMA survey can reveal the dust-obscured star formation activities, which were missed in previous deep optical/near-infrared surveys.
VersionFinal published version
SponsorsJSPS [JP17H06130]; NAOJ ALMA [2017-06B]; JSPS fellowship