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  1. OA@INAF
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  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/20.500.12386/26746
Title: The Spatially Resolved [CII] Cooling Line Deficit in Galaxies
Authors: Smith, J. D. T.
Croxall, Kevin
Draine, Bruce
De Looze, Ilse
Sandstrom, Karin
Armus, Lee
Beirão, Pedro
Bolatto, Alberto
Boquien, Mederic
Brandl, Bernhard
Crocker, Alison
Dale, Daniel A.
Galametz, Maud
Groves, Brent
Helou, George
Herrera-Camus, Rodrigo
HUNT, Leslie Kipp 
Kennicutt, Robert
Walter, Fabian
Wolfire, Mark
Issue Date: 2017
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 834
Issue: 1
First Page: 5
Abstract: We present [C II] 158 μm measurements from over 15,000 resolved regions within 54 nearby galaxies of the Kingfish program to investigate the so-called [C II] “line-cooling deficit” long known to occur in galaxies with different luminosities. The [C II]/TIR ratio ranges from above 1% to below 0.1% in the sample, with a mean value of 0.48 ± 0.21%. We find that the surface density of 24 μm emission dominates this trend, with [C II]/TIR dropping as ν {I}<SUB>ν </SUB>(24 μ {{m}}) increases. Deviations from this overall decline are correlated with changes in the gas-phase metal abundance, with higher metallicity associated with deeper deficits at a fixed surface brightness. We supplement the local sample with resolved [C II] measurements from nearby luminous infrared galaxies and high-redshift sources from z = 1.8-6.4, and find that star formation rate density drives a continuous trend of deepening [C II] deficit across six orders of magnitude in {{{Σ }}}<SUB>{{sfr</SUB>}}. The tightness of this correlation suggests that an approximate {{{Σ }}}<SUB>{{sfr</SUB>}} can be estimated directly from global measurements of [C II]/TIR, and a relation is provided to do so. Several low-luminosity active galactic nucleus (AGN) hosts in the sample show additional and significant central suppression of [C II]/TIR, but these deficit enhancements occur not in those AGNs with the highest X-ray luminosities, but instead those with the highest central starlight intensities. Taken together, these results demonstrate that the [C II] line-cooling line deficit in galaxies likely arises from local physical phenomena in interstellar gas.
URI: http://hdl.handle.net/20.500.12386/26746
URL: https://iopscience.iop.org/article/10.3847/1538-4357/834/1/5
ISSN: 0004-637X
DOI: 10.3847/1538-4357/834/1/5
Bibcode ADS: 2017ApJ...834....5S
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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