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- W3125117136 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 −0.6 +1.3 × 10 11 M ⊙ and SFR = 430 −150 +230 M ⊙ yr −1 . The molecular gas mass was derived to be M (H 2 ) [CI] = (5.9 ± 1.5)×10 10 M ⊙ , indicating a gas fraction of ≈35%, and the ratios of L [CI](1−0) / L IR and L [CI](1−0) / L CO(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 ( τ dep ≈ 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." @default.
- W3125117136 created "2021-02-01" @default.
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- W3125117136 date "2020-08-01" @default.
- W3125117136 modified "2023-10-04" @default.
- W3125117136 title "ALMA Deep Field in SSA22" @default.
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- W3125117136 doi "https://doi.org/10.1051/0004-6361/202038146" @default.
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