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

Fudamoto, Y, Smit, R, Bowler, RAA, Oesch, PA, Bouwens, R, Stefanon, M, Inami, H, Endsley, R, Gonzalez, V, Schouws, S, Stark, D, Algera, HSB, Aravena, M, Barrufet, L, da Cunha, E, Dayal, P, Ferrara, A, Graziani, L, Hodge, JA, Hygate, APS , Inoue, AK, Nanayakkara, T, Pallottini, A, Pizzati, E, Schneider, R, Sommovigo, L, Sugahara, Y, Topping, M, van der Werf, P, Bethermin, M, Cassata, P, Dessauges-Zavadsky, M, Ibar, E, Faisst, AL, Fujimoto, S, Ginolfi, M, Hathi, N, Jones, GC, Pozzi, F and Schaerer, D (2022) The ALMA REBELS Survey: Average [C ii] 158 μm Sizes of Star-forming Galaxies from z ∼ 7 to z ∼ 4. The Astrophysical Journal, 934 (2). ISSN 1538-4357

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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 re 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 re = 2.2 ± 0.2 kpc and re = 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.

Item Type: Article
Uncontrolled Keywords: 0201 Astronomical and Space Sciences; 0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics; 0306 Physical Chemistry (incl. Structural); Astronomy & Astrophysics
Subjects: Q Science > QB Astronomy
Divisions: Astrophysics Research Institute
Publisher: American Astronomical Society
SWORD Depositor: A Symplectic
Date Deposited: 08 Nov 2022 14:00
Last Modified: 08 Nov 2022 14:15
DOI or ID number: 10.3847/1538-4357/ac7a47
URI: https://researchonline.ljmu.ac.uk/id/eprint/18071
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