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GOODS-ALMA: the slow downfall of star formation in z = 2-3 massive galaxies
Version 2 2023-06-12, 09:34
Version 1 2023-06-09, 22:05
journal contribution
posted on 2023-06-12, 09:34 authored by M Franco, D Elbaz, L Zhou, B Magnelli, C Schreiber, L Ciesla, M Dickinson, N Nagar, G Magdis, D M Alexander, M Béthermin, R Demarco, E Daddi, T Wang, Mark Sargent, othersWe investigate the properties of a sample of 35 galaxies, detected with the Atacama Large Millimeter/Submillimeter Array (ALMA) at 1.1 mm in the GOODS-ALMA field (area of 69 arcmin2, resolution = 0.60?, rms ? 0.18 mJy beam-1). Using the ultraviolet-to-radio deep multiwavelength coverage of the GOODS-South field, we fit the spectral energy distributions of these galaxies to derive their key physical properties. The galaxies detected by ALMA are among the most massive at z = 2-4 (M?, med = 8.5 × 1010 M?) and they are either starburst or located in the upper part of the galaxy star-forming main sequence. A significant portion of our galaxy population (~40%), located at z ~ 2.5 - 3, exhibits abnormally low gas fractions. The sizes of these galaxies, measured with ALMA, are compatible with the trend between the rest-frame 5000 Å size and stellar mass observed for z ~ 2 elliptical galaxies, suggesting that they are building compact bulges. We show that there is a strong link between star formation surface density (at 1.1 mm) and gas depletion time: The more compact a galaxy's star-forming region is, the shorter its lifetime will be (without gas replenishment). The identified compact sources associated with relatively short depletion timescales (~100 Myr) are the ideal candidates to be the progenitors of compact elliptical galaxies at z ~ 2.
Funding
University of Sussex Astronomy Consolidated Grant 2017-2020; G2050; STFC-SCIENCE AND TECHNOLOGY FACILITIES COUNCIL; ST/P000525/1
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- Published
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- Published version
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Astronomy and AstrophysicsISSN
0004-6361Publisher
EDP SciencesExternal DOI
Issue
A30Volume
643Page range
1-17Department affiliated with
- Physics and Astronomy Publications
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- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2020-11-09First Open Access (FOA) Date
2020-11-09First Compliant Deposit (FCD) Date
2020-11-06Usage metrics
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