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The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: The nature of the faintest dusty star-forming galaxies | | Manuel Aravena
; Leindert Boogaard
; Jorge Gónzalez-López
; Roberto Decarli
; Fabian Walter
; Chris L. Carilli
; Ian Smail
; Axel Weiss
; Roberto J. Assef
; Franz Erik Bauer
; Rychard J. Bouwens
; Paulo C. Cortes
; Pierre Cox
; Elisabete da Cunha
; Emanuele Daddi
; Tanio Díaz-Santos
; Hanae Inami
; Rob Ivison
; Mladen Novak
; Gergö Popping
; Dominik Riechers
; Paul van der Werf
; Jeff Wagg
; | | Date: |
8 Jun 2020 | | Abstract: | 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 {it 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 $4.8 imes10^{10}~M_odot$ and 30
$M_odot$ yr$^{-1}$, and interquartile ranges of
$(2.4-11.7) imes10^{10}~M_odot$ and $20-50~M_odot$ yr$^{-1}$, respectively.
We derive a median spectroscopic redshift of 1.8 with an interquartile range
$1.1-2.6$, significantly lower than sub-millimeter galaxies detected in
shallower, wide-field surveys. We find that 59\%$pm$13\%, 6\%$pm$4\%, and
34\%$pm$9\% of our sources are within, above and below $pm0.4$ 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 $z=2.5$, 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 $sim0.1-0.2$ and long
depletion timescales $>1$ Gyr. Galaxies along the MS dominate the cosmic
density of molecular gas at all redshifts. Systems above the main sequence 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. | | Source: | arXiv, 2006.4284 | | Services: | Forum | Review | PDF | Favorites | |
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