Hideki Umehata
ALMA Deep Field in SSA22
Umehata, Hideki; Smail, Ian; Swinbank, A.M.; Kohno, Kotaro; Tamura, Yoichi; Wang, Tao; Ao, Yiping; Hatsukade, Bunyo; Kubo, Mariko; Nakanishi, Kouchiro; Hayatsu, Natsuki N.
Authors
Professor Ian Smail ian.smail@durham.ac.uk
Emeritus Professor
Professor Mark Swinbank a.m.swinbank@durham.ac.uk
Professor
Kotaro Kohno
Yoichi Tamura
Tao Wang
Yiping Ao
Bunyo Hatsukade
Mariko Kubo
Kouchiro Nakanishi
Natsuki N. Hayatsu
Abstract
Deep surveys with the Atacama Large Millimeter Array (ALMA) have uncovered a population of dusty star-forming galaxies which are faint or even undetected at optical to near-infrared wavelengths. Their faintness at short wavelengths makes the detailed characterization of the population challenging. Here we present a spectroscopic redshift identification and a characterization of one of these near-infrared-dark galaxies discovered by an ALMA deep survey. The detection of [C i](1–0) and CO(4–3) emission lines determines the precise redshift of the galaxy, ADF22.A2, to be z = 3.9913 ± 0.0008. On the basis of a multi-wavelength analysis, ADF22.A2 is found to be a massive, star-forming galaxy with a stellar mass of M∗ = 1.1 +1.3 −0.6 × 1011 M and SFR= 430+230 −150 M yr−1 . The molecular gas mass was derived to be M(H2) [CI] = (5.9 ± 1.5) × 1010 M, indicating a gas fraction of ≈35%, and the ratios of L[CI](1−0)/LIR and L[CI](1−0)/LCO(4−3) suggest that the nature of the interstellar medium in ADF22.A2 is in accordance with those of other bright submillimeter galaxies. The properties of ADF22.A2, including the redshift, star-formation rate, stellar mass, and depletion time scale (τdep ≈ 0.1−0.2 Gyr), also suggest that ADF22.A2 has the characteristics expected for the progenitors of quiescent galaxies at z & 3. Our results demonstrate the power of ALMA contiguous mapping and line scan, which help us to obtain an unbiased view of galaxy formation in the early Universe.
Journal Article Type | Article |
---|---|
Acceptance Date | Jul 12, 2020 |
Online Publication Date | Aug 3, 2020 |
Publication Date | 2020-08 |
Deposit Date | Aug 19, 2020 |
Publicly Available Date | Aug 19, 2020 |
Journal | Astronomy and astrophysics. |
Print ISSN | 0004-6361 |
Electronic ISSN | 1432-0746 |
Publisher | EDP Sciences |
Peer Reviewed | Peer Reviewed |
Volume | 640 |
Article Number | L8 |
DOI | https://doi.org/10.1051/0004-6361/202038146 |
Public URL | https://durham-repository.worktribe.com/output/1294280 |
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Copyright Statement
Umehata, Hideki, Smail, Ian, Swinbank, A. M., Kohno, Kotaro, Tamura, Yoichi, Wang, Tao, Ao, Yiping, Hatsukade, Bunyo, Kubo, Mariko, Nakanishi, Kouchiro & Hayatsu, Natsuki N. (2020). ALMA Deep Field in SSA22. Astronomy & Astrophysics 640: L8, reproduced with permission, © ESO.
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