The ALMA REBELS Survey: Average [C II] 158 μm Sizes of Star-forming Galaxies from z 7 to z 4 - INSU - Institut national des sciences de l'Univers Access content directly
Journal Articles The Astrophysical Journal Year : 2022

The ALMA REBELS Survey: Average [C II] 158 μm Sizes of Star-forming Galaxies from z 7 to z 4

Y. Fudamoto
  • Function : Author
R. Smit
  • Function : Author
R. A. A. Bowler
  • Function : Author
P. A. Oesch
  • Function : Author
R. Bouwens
  • Function : Author
M. Stefanon
  • Function : Author
H. Inami
  • Function : Author
R. Endsley
  • Function : Author
V. Gonzalez
  • Function : Author
S. Schouws
  • Function : Author
D. Stark
  • Function : Author
H. S. B. Algera
  • Function : Author
M. Aravena
  • Function : Author
L. Barrufet
  • Function : Author
E. da Cunha
  • Function : Author
P. Dayal
  • Function : Author
A. Ferrara
  • Function : Author
L. Graziani
  • Function : Author
J. A. Hodge
  • Function : Author
A. P. S. Hygate
  • Function : Author
A. K. Inoue
  • Function : Author
T. Nanayakkara
  • Function : Author
A. Pallottini
  • Function : Author
E. Pizzati
  • Function : Author
R. Schneider
  • Function : Author
L. Sommovigo
  • Function : Author
Y. Sugahara
  • Function : Author
M. Topping
  • Function : Author
P. van der Werf
  • Function : Author
P. Cassata
  • Function : Author
M. Dessauges-Zavadsky
  • Function : Author
E. Ibar
  • Function : Author
A. L. Faisst
  • Function : Author
S. Fujimoto
  • Function : Author
M. Ginolfi
  • Function : Author
N. Hathi
  • Function : Author
G. C. Jones
  • Function : Author
F. Pozzi
  • Function : Author
D. Schaerer
  • Function : Author

Abstract

We present the average [C II] 158 μm emission line sizes of UV-bright star-forming galaxies at z ~ 7. Our results are derived from a stacking analysis of [C II] 158 μm emission lines and dust continua observed by the Atacama Large Millimeter/submillimeter Array (ALMA), taking advantage of the large program Reionization Era Bright Emission Line Survey. We find that the average [C II] emission at z ~ 7 has an effective radius r e of 2.2 ± 0.2 kpc. It is ≳2× larger than the dust continuum and the rest-frame UV emission, in agreement with recently reported measurements for z ≲ 6 galaxies. Additionally, we compared the average [C II] size with 4 < z < 6 galaxies observed by the ALMA Large Program to INvestigate [C II] at Early times (ALPINE). By analyzing [C II] sizes of 4 < z < 6 galaxies in two redshift bins, we find an average [C II] size of r e = 2.2 ± 0.2 kpc and r e = 2.5 ± 0.2 kpc for z ~ 5.5 and z ~ 4.5 galaxies, respectively. These measurements show that star-forming galaxies, on average, show no evolution in the size of the [C II] 158 μm emitting regions at redshift between z ~ 7 and z ~ 4. This finding suggests that the star-forming galaxies could be morphologically dominated by gas over a wide redshift range.
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insu-03763628 , version 1 (29-08-2022)

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Y. Fudamoto, R. Smit, R. A. A. Bowler, P. A. Oesch, R. Bouwens, et al.. The ALMA REBELS Survey: Average [C II] 158 μm Sizes of Star-forming Galaxies from z 7 to z 4. The Astrophysical Journal, 2022, 934, ⟨10.3847/1538-4357/ac7a47⟩. ⟨insu-03763628⟩
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