TY - JOUR
T1 - ALMA 26 arcmin2 Survey of GOODS-S at 1 mm (ASAGAO)
T2 - Near-infrared-dark Faint ALMA Sources
AU - Yamaguchi, Yuki
AU - Kohno, Kotaro
AU - Hatsukade, Bunyo
AU - Wang, Tao
AU - Yoshimura, Yuki
AU - Ao, Yiping
AU - Caputi, Karina I.
AU - Dunlop, James S.
AU - Egami, Eiichi
AU - Espada, Daniel
AU - Fujimoto, Seiji
AU - Hayatsu, Natsuki H.
AU - Ivison, Rob J.
AU - Kodama, Tadayuki
AU - Kusakabe, Haruka
AU - Nagao, Tohru
AU - Ouchi, Masami
AU - Rujopakarn, Wiphu
AU - Tadaki, Ken Ichi
AU - Tamura, Yoichi
AU - Ueda, Yoshihiro
AU - Umehata, Hideki
AU - Wang, Wei Hao
AU - Yun, Min S.
N1 - Publisher Copyright:
© 2019. The American Astronomical Society. All rights reserved.
PY - 2019/6/10
Y1 - 2019/6/10
N2 - We report detections of two 1.2 mm continuum sources (S 1.2 mm ∼ 0.6 mJy) without any counterparts in the deep H- and/or K-band image (i.e., K-band magnitude ≳26 mag). These near-infrared-dark faint millimeter sources are uncovered by ASAGAO, a deep and wide-field (≃26 arcmin2) Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm survey. One has a red IRAC (3.6 and 4.5 μm) counterpart, and the other has been independently detected at 850 and 870 μm using SCUBA2 and ALMA Band 7, respectively. Their optical-to-radio spectral energy distributions indicate that they can lie at z ≳ 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 ∼1 ×10-3 M o yr-1 Mpc-3 if they lie somewhere in the redshift range of z ∼ 3-5. This value can be consistent with, or greater than, that of bright submillimeter galaxies (S 870 μm > 4.2 mJy) at z ∼ 3-5. We also uncover three more candidate near-infrared-dark faint ALMA sources without any counterparts (S 1.2 mm ∼ 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.
AB - We report detections of two 1.2 mm continuum sources (S 1.2 mm ∼ 0.6 mJy) without any counterparts in the deep H- and/or K-band image (i.e., K-band magnitude ≳26 mag). These near-infrared-dark faint millimeter sources are uncovered by ASAGAO, a deep and wide-field (≃26 arcmin2) Atacama Large Millimeter/submillimeter Array (ALMA) 1.2 mm survey. One has a red IRAC (3.6 and 4.5 μm) counterpart, and the other has been independently detected at 850 and 870 μm using SCUBA2 and ALMA Band 7, respectively. Their optical-to-radio spectral energy distributions indicate that they can lie at z ≳ 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 ∼1 ×10-3 M o yr-1 Mpc-3 if they lie somewhere in the redshift range of z ∼ 3-5. This value can be consistent with, or greater than, that of bright submillimeter galaxies (S 870 μm > 4.2 mJy) at z ∼ 3-5. We also uncover three more candidate near-infrared-dark faint ALMA sources without any counterparts (S 1.2 mm ∼ 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.
KW - galaxies: evolution
KW - galaxies: high-redshift
KW - galaxies: star formation
KW - submillimeter: galaxies
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U2 - 10.3847/1538-4357/ab0d22
DO - 10.3847/1538-4357/ab0d22
M3 - Article
AN - SCOPUS:85069512583
VL - 878
JO - Astrophysical Journal
JF - Astrophysical Journal
SN - 0004-637X
IS - 1
M1 - 73
ER -