期刊
ASTROPHYSICAL JOURNAL
卷 901, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.3847/1538-4357/ab99a2
关键词
Galaxy evolution; Galaxy quenching; Submillimeter astronomy; High-redshift galaxies
资金
- CONICYT + PCI + INSTITUTO MAX PLANCK DE ASTRONOMIA [MPG190030]
- CONICYT+PCI+REDES [190194]
- ALMA-CONICYT [31160033, 31130005]
- ERC
- CONICYT [CATA-Basal AFB-170002]
- FONDECYT [1190818, 1200495, 1151239]
- Chile's Ministry of Economy, Development, and Tourism's Millennium Science Initiative [IC120009]
- National Science Foundation [AST-1614213, AST-1910107]
- Alexander von Humboldt Foundation
- STFC [ST/P000541/1]
- JSPS KAKENHI [JP19K23462]
We present a characterization of the physical properties of a sample of 35 securely detected, dusty galaxies in the deep ALMA 1.2 mm image obtained as part of the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS) Large Program. This sample is complemented by 26 additional sources identified via an optical/ infrared source positional prior. Using their well-characterized spectral energy distributions, we derive median stellar masses and star formation rates (SFR) of 4.8 x 10(10) M-circle dot and 30 M-circle dot yr(-1), respectively, and interquartile ranges of (2.4-11.7) x 10(10) M-circle dot and 20-50 M-circle dot yr(-1). We derive a median spectroscopic redshift of 1.8 with an interquartile range 1.1-2.6, significantly lower than submillimeter galaxies detected in shallower, wide-field surveys. We find that 59%.+/-.13%, 6%.+/-.4%, and 34%.+/-.9% of our sources are within, above, and below +/- 0.4 dex from the SFR-stellar-mass relation or main sequence (MS), respectively. The ASPECS galaxies closely follow the SFR-molecular gas mass relation and other previously established scaling relations, confirming a factor of five increase of the gas-to-stellar-mass ratio from z.=.0.5 to 2.5 and a mild evolution of the gas depletion timescales with a typical value of 0.7 Gyr at z.=.1-3. ASPECS galaxies located significantly below the MS, a poorly exploited parameter space, have low gas-to-stellar-mass ratios of similar to 0.1-0.2 and long depletion timescales >1 Gyr. Galaxies along the MS dominate the cosmic density of molecular gas at all redshifts. Systems above the MS have an increasing contribution to the total gas reservoirs from z < 1 to z = 2.5, while the opposite is found for galaxies below the MS.
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