2020A&A...640L...8U


C.D.S. - SIMBAD4 rel 1.7 - 2020.10.26CET14:52:53

2020A&A...640L...8U - Astronomy and Astrophysics, volume 640, L8-8 (2020/8-1)

ALMA Deep Field in SSA22. A near-infrared-dark submillimeter galaxy at z = 4.0.

UMEHATA H., SMAIL I., SWINBANK A.M., KOHNO K., TAMURA Y., WANG T., AO Y., HATSUKADE B., KUBO M., NAKANISHI K. and HAYATSU N.N.

Abstract (from CDS):

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 [CI](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+1.3x1011M and SFR=430–150+230M/yr. The molecular gas mass was derived to be M(H2)[CI]=(5.9±1.5)x1010M, 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≃0.1-0.2Gyr), 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.

Abstract Copyright: © ESO 2020

Journal keyword(s): submillimeter: galaxies - galaxies: starburst - galaxies: high-redshift - submillimeter: ISM - galaxies: evolution

Simbad objects: 7

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Number of rows : 7

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME Extended Chandra Deep Field South reg 03 32 30.0 -27 48 20           ~ 623 0
2 NAME MM J123633+6214.1 G 12 36 33.2 +62 14 07           ~ 55 0
3 NAME SMM J123652+621225 G 12 36 51.730 +62 12 21.44 24.2 23.4 22.3 22.0 25.80 ~ 169 1
4 4C 06.69 QSO 21 48 05.4585565234 +06 57 38.605396596   16.85 16.47 15.06   ~ 602 1
5 SSA 22 reg 22 17 34.7 +00 15 07           ~ 267 0
6 4C 00.81 QSO 22 26 46.5370259 +00 52 11.331423   21.64 20.97 19.62   ~ 69 1
7 4C 11.69 QSO 22 32 36.40890517 +11 43 50.9040717   17.75 17.33     ~ 983 2

    Equat.    Gal    SGal    Ecl

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2020.10.26-14:52:53

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