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Journal Article

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

MPS-Authors

Rybak,  Matus
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Calistro Rivera,  G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hodge,  J. A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Smail,  Ian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Walter,  F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

van der Werf,  P.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

da Cunha,  E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Chen,  Chian-Chou
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Dannerbauer,  H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Ivison,  R. J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Karim,  A.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Simpson,  J. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Swinbank,  A. M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Wardlow,  J. L.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2019ApJ...876..112R
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Citation

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.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CFE0-5
Abstract
We present 0.″15 (1 kpc) resolution ALMA observations of the [C II] 157.74 μm line and rest-frame 160 μm continuum emission in two z ∼ 3 dusty, star-forming galaxies—ALESS 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 ≤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 μm 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 ≃2 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 ∼ 104) and high gas density (n(H) ∼ 104-105 cm−3) 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 ≥500 K, driven by the strong FUV field.