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  Strong Far-ultraviolet Fields Drive the [C II]/Far-infrared Deficit in z¬†‚ຬ†3 Dusty, Star-forming Galaxies

Rybak, M., Calistro Rivera, G., Hodge, J. A., Smail, I., Walter, F., van der Werf, P., et al. (2019). Strong Far-ultraviolet Fields Drive the [C II]/Far-infrared Deficit in z ∼ 3 Dusty, Star-forming Galaxies. The Astrophysical Journal, 876.

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Rybak, Matus1, Author
Calistro Rivera, G.1, Author
Hodge, J. A.1, Author
Smail, Ian1, Author
Walter, F.1, Author
van der Werf, P.1, Author
da Cunha, E.1, Author
Chen, Chian-Chou1, Author
Dannerbauer, H.1, Author
Ivison, R. J.1, Author
Karim, A.1, Author
Simpson, J. M.1, Author
Swinbank, A. M.1, Author
Wardlow, J. L.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: galaxies: high-redshift galaxies: star formation submillimeter: galaxies Astrophysics - Astrophysics of Galaxies
 Abstract: We present 0.‚Ä≥15 (1 kpc) resolution ALMA observations of the [C II] 157.74 Œºm line and rest-frame 160 Œºm continuum emission in two z ‚ຠ3 dusty, star-forming galaxies‚ÄîALESS 49.1 and ALESS 57.1, combined with resolved CO (3-2) observations. In both sources, the [C II] surface brightness distribution is dominated by a compact core ‚â§1 kpc in radius, a factor of 2-3 smaller than the extent of the CO (3-2) emission. In ALESS 49.1, we find an additional extended (8 kpc radius), low surface brightness [C II] component. Based on an analysis of mock ALMA observations, the [C II] and 160 Œºm continuum surface brightness distributions are inconsistent with a single-Gaussian surface brightness distribution with the same size as the CO (3-2) emission. The [C II] rotation curves flatten at ‚âÉ2 kpc radius, suggesting that the kinematics of the central regions are dominated by a baryonic disk. Both galaxies exhibit a strong [C II]/far-IR (FIR) deficit on 1 kpc scales, with FIR surface brightness to [C II]/FIR slope steeper than in local star- forming galaxies. A comparison of the [C II]/CO (3-2) observations with photodissociation region models suggests a strong far-UV (FUV) radiation field (G 0 ‚ຠ104) and high gas density (n(H) ‚ຠ104-105 cm‚àí3) in the central regions of ALESS 49.1 and ALESS 57.1. The most direct interpretation of the pronounced [C II]/FIR deficit is a thermal saturation of the C+ fine-structure levels at temperatures ‚â•500 K, driven by the strong FUV field.

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 Dates: 2019
 Publication Status: Issued
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Title: The Astrophysical Journal
Source Genre: Journal
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Pages: - Volume / Issue: 876 Sequence Number: - Start / End Page: - Identifier: -