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  1. OA@INAF
  2. PRODOTTI RICERCA INAF
  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
  4. 1.01 Articoli in rivista
Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/26744
Title: The Origins of [C II] Emission in Local Star-forming Galaxies
Authors: Croxall, K. V.
Smith, J. D.
Pellegrini, E.
Groves, B.
Bolatto, A.
Herrera-Camus, R.
Sandstrom, K. M.
Draine, B.
Wolfire, M. G.
Armus, L.
Boquien, M.
Brandl, B.
Dale, D.
Galametz, M.
HUNT, Leslie Kipp 
Kennicutt, R., Jr.
Kreckel, K.
Rigopoulou, D.
van der Werf, P.
Wilson, C.
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 845
Issue: 2
First Page: 96
Abstract: The [C II] 158 μm fine-structure line is the brightest emission line observed in local star-forming galaxies. As a major coolant of the gas-phase interstellar medium, [C II] balances the heating, including that due to far-ultraviolet photons, which heat the gas via the photoelectric effect. However, the origin of [C II] emission remains unclear because C<SUP>+</SUP> can be found in multiple phases of the interstellar medium. Here we measure the fractions of [C II] emission originating in the ionized and neutral gas phases of a sample of nearby galaxies. We use the [N II] 205 μm fine-structure line to trace the ionized medium, thereby eliminating the strong density dependence that exists in the ratio of [C II]/[N II] 122 μm. Using the FIR [C II] and [N II] emission detected by the KINGFISH (Key Insights on Nearby Galaxies: a Far- Infrared Survey with Herschel) and Beyond the Peak Herschel programs, we show that 60%─80% of [C II] emission originates from neutral gas. We find that the fraction of [C II] originating in the neutral medium has a weak dependence on dust temperature and the surface density of star formation, and has a stronger dependence on the gas-phase metallicity. In metal-rich environments, the relatively cooler ionized gas makes substantially larger contributions to total [C II] emission than at low abundance, contrary to prior expectations. Approximate calibrations of this metallicity trend are provided.
URI: http://hdl.handle.net/20.500.12386/26744
URL: https://iopscience.iop.org/article/10.3847/1538-4357/aa8035
ISSN: 0004-637X
DOI: 10.3847/1538-4357/aa8035
Bibcode ADS: 2017ApJ...845...96C
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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