Abstract
We make use of the ALMA twenty-Six Arcmin2 survey of GOODS-S At One-millimeter (ASAGAO), deep 1.2 mm continuum observations of a 26-arcmin2
region in the Great Observatories Origins Deep Survey-South (GOODS-S)
obtained with Atacama Large Millimeter/sub-millimeter Array (ALMA), to
probe dust-enshrouded star formation in K-band selected (i.e.,
stellar mass selected) galaxies, which are drawn from the FourStar
Galaxy Evolution Survey (ZFOURGE) catalog. Based on the ASAGAO combined
map, which was created by combining ASAGAO and ALMA archival data in the
GOODS-South field, we find that 24 ZFOURGE sources have 1.2 mm
counterparts with a signal-to-noise ratio >4.5 (1σ ≃ 30–70 μJy beam−1 at 1.2 mm). Their median redshift is estimated to be zmedian = 2.38
± 0.14. They generally follow the tight relationship of the stellar
mass versus star formation rate (i.e., the main sequence of star-forming
galaxies). ALMA-detected ZFOURGE sources exhibit systematically larger
infrared (IR) excess (IRX ≡ LIR/LUV)
compared to ZFOURGE galaxies without ALMA detections even though they
have similar redshifts, stellar masses, and star formation rates. This
implies the consensus stellar-mass versus IRX relation, which is known
to be tight among rest-frame-ultraviolet-selected galaxies, cannot fully
predict the ALMA detectability of stellar-mass-selected galaxies. We
find that ALMA-detected ZFOURGE sources are the main contributors to the
cosmic IR star formation rate density at z = 2–3.
Original language | English |
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Journal | Publications of Astronomical Society of Japan |
Volume | 72 |
Issue number | 4 |
Early online date | 30 Jun 2020 |
DOIs | |
Publication status | Published - 1 Aug 2020 |
Keywords
- astro-ph.GA