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GOODS-ALMA 2.0: Source catalog, number counts, and prevailing compact sizes in 1.1 mm galaxies | | C. Gómez-Guijarro
; D. Elbaz
; M. Xiao
; M. Béthermin
; M. Franco
; B. Magnelli
; E. Daddi
; M. Dickinson
; R. Demarco
; H. Inami
; W. Rujopakarn
; G. E. Magdis
; X. Shu
; R. Chary
; L. Zhou
; D. M. Alexander
; F. Bournaud
; L. Ciesla
; H. C. Ferguson
; S. L. Finkelstein
; C. Finlez
; M. Giavalisco
; D. Iono
; S. Juneau
; J. S. Kartaltepe
; G. Lagache
; E. Le Floc'h
; R. Leiton
; L. Lin
; H. Messias
; K. Motohara
; J. Mullaney
; N. M. Nagar
; K. Okumura
; M. Pannella
; C. Papovich
; A. Pope
; M. T. Sargent
; J. D. Silverman
; E. Treister
; T. Wang
; | | Date: |
24 Jun 2021 | | Abstract: | Sub/millimiter observations of dusty star-forming galaxies with ALMA have
shown that the dust continuum emission occurs generally in compact regions
smaller than the stellar distribution. However, it remains to be understood how
systematic these findings are, as they often lack of homogeneity in the sample
selection, target discontinuous areas with inhomogeneous sensitivities, and
suffer from modest $uv$-coverage coming from single array configurations.
GOODS-ALMA is a 1.1 mm galaxy survey over a continuous area of 72.42 arcmin$^2$
at a homogeneous sensitivity. In this version 2.0, we present a new
low-resolution dataset and its combination with the previous high-resolution
dataset from Franco et al. (2018), improving the $uv$-coverage and sensitivity
reaching an average of $sigma = 68.4$ $mu$Jy beam$^{-1}$. A total of 88
galaxies are detected in a blind search (compared to 35 in the high-resolution
dataset alone), 50% at $
m{S/N_{peak}} geq 5$ and 50% at $3.5 leq
m{S/N_{peak}} leq 5$ aided by priors. Among them, 13/88 are optically
dark/faint sources ($H$ or $K$-band dropouts). The sample dust continuum sizes
at 1.1 mm are generally compact, with a median effective radius of $R_{
m{e}}
= 0"10 pm 0"05$ (physical size of $R_{
m{e}} = 0.73 pm 0.29$ kpc, at the
redshift of each source). Dust continuum sizes evolve with redshift and stellar
mass resembling the trends of the stellar sizes measured at optical
wavelengths, albeit a lower normalization compared to those of late-type
galaxies. We conclude that for sources with flux densities $S_{
m{1.1mm}} > 1$
mJy compact dust continuum emission at 1.1 mm prevails, and sizes as extended
as typical star-forming stellar disks are rare. $S_{
m{1.1mm}} < 1$ mJy
sources appear slightly more extended at 1.1 mm, although still generally
compact below the sizes of typical star-forming stellar disks. | | Source: | arXiv, 2106.13246 | | Services: | Forum | Review | PDF | Favorites | |
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