ALMA 26 arcmin2 Survey of GOODS-S at 1 mm (ASAGAO): Near-infrared-dark Faint ALMA SourcesYamaguchi, Y., Kohno, K., Hatsukade, B., Wang, T., Yoshimura, Y., Ao, Y., Caputi, K. I., Dunlop, J. S., Egami, E., Espada, D., Fujimoto, S., Hayatsu, N. H., Ivison, R. J., Kodama, T., Kusakabe, H., Nagao, T., Ouchi, M., Rujopakarn, W., Tadaki, K., Tamura, Y., Ueda, Y., Umehata, H., Wang, W-H. & Yun, M. S., 1-Jun-2019, In : The Astrophysical Journal. 878, 1, 8 p., 73.
Research output: Contribution to journal › Article › Academic › peer-review
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 ⊙ 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.
|Number of pages||8|
|Journal||The Astrophysical Journal|
|Publication status||Published - 1-Jun-2019|
- galaxies: evolution, galaxies: high-redshift, galaxies: star formation, submillimeter: galaxies, SPECTRAL ENERGY-DISTRIBUTION, GALAXIES, CAMERA, IRAC