The case for thermalization as a contributor to the [C II] deficit
- Creators
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Sutter, Jessica
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Dale, Daniel A.
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Sandstrom, Karin
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Smith, J. D. T.
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Bolatto, Alberto
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Boquien, Médéric
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Calzetti, Daniela
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Croxall, Kevin V.
- De Looze, Ilse
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Galametz, Maud
- Groves, Brent A.
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Helou, George
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Herrera-Camus, Rodrigo
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Hunt, Leslie K.
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Kennicutt, Robert C.
- Pelligrini, Eric W.
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Wilson, Christine
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Wolfire, Mark G.
Abstract
The [C II] deficit, which describes the observed decrease in the ratio of [C II] 158 μm emission to continuum infrared emission in galaxies with high star formation surface densities, places a significant challenge to the interpretation of [C II] detections from across the observable universe. In an attempt to further decode the cause of the [C II] deficit, the [C II] and dust continuum emission from 18 Local Volume galaxies has been split based on conditions within the interstellar medium where it originated. This is completed using the Key Insights in Nearby Galaxies: a Far-Infrared Survey with Herschel (KINGFISH) and Beyond the Peak (BtP) surveys and the wide-range of wavelength information, from UV to far-infrared emission lines, available for a selection of star-forming regions within these samples. By comparing these subdivided [C II] emissions to isolated infrared emission and other properties, we find that the thermalization (collisional de-excitation) of the [C II] line in H II regions plays a significant role in the deficit observed in our sample.
Additional Information
© 2021 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2021 February 16. Received 2021 February 1; in original form 2020 December 9. Published: 20 February 2021. This work was supported by NASA Headquarters under the NASA Earth and Space Science Fellowship Program, Grant #80NSSC18K1107, as the Wyoming NASA Space Grant Consortium, NASA Grant #NNX15AI08H. Herschel is an ESA space observatory with science instruments provided by European-led Principal Investigator consortia and with important participation from NASA. IRAF, the Image Reduction and Analysis Facility, has been developed by the National Optical Astronomy Observatories and the Space Telescope Science Institute. Data Availability: All data are available through IRSA through the KINGFISH database at https://irsa.ipac.caltech.edu/data/Herschel/KINGFISH/ with the exception of the SPIRE spectroscopy, which is available upon request.Attached Files
Published - stab490.pdf
Accepted Version - 2102.08865.pdf
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Additional details
- Alternative title
- The Case for Thermalization as a Contributor to the [CII] Deficit
- Eprint ID
- 109340
- Resolver ID
- CaltechAUTHORS:20210602-100900704
- 80NSSC18K1107
- NASA Earth and Space Science Fellowship
- Wyoming NASA Space Grant Consortium
- NNX15AI08H
- NASA
- Created
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2021-06-02Created from EPrint's datestamp field
- Updated
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2021-06-03Created from EPrint's last_modified field
- Caltech groups
- Infrared Processing and Analysis Center (IPAC)