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The Case for Thermalization as a Contributor to the [CII] Deficit
- Source :
- MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
- Publication Year :
- 2021
-
Abstract
- The [CII] deficit, which describes the observed decrease in the ratio of [CII] 158 micron emission to continuum infrared emission in galaxies with high star formation surface densities, places a significant challenge to the interpretation of [CII] detections from across the observable universe. In an attempt to further decode the cause of the [CII] deficit, the [CII] 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 [CII] emissions to isolated infrared emission and other properties, we find that the thermalization (collisional de-excitation) of the [CII] line in HII regions plays a significant role in the deficit observed in our sample.<br />To be published in MNRAS, 8 pages, 6 figures
- Subjects :
- GALAXY NUCLEI
Infrared
) photodissociation regions [(ISM]
Continuum (design consultancy)
FOS: Physical sciences
Observable universe
Astrophysics
SPECTRAL ENERGY-DISTRIBUTIONS
Astrophysics::Cosmology and Extragalactic Astrophysics
Computer Science::Computational Geometry
01 natural sciences
FAR-INFRARED LINE
STAR-FORMATION
NEARBY
0103 physical sciences
Astrophysics::Solar and Stellar Astrophysics
Emission spectrum
PHYSICAL CONDITIONS
010303 astronomy & astrophysics
Astrophysics::Galaxy Astrophysics
Line (formation)
Physics
C-II EMISSION
MU-M EMISSION
) HII Regions [(ISM]
INTERSTELLAR-MEDIUM
ISM [galaxies]
010308 nuclear & particles physics
Star formation
Astronomy and Astrophysics
Astrophysics - Astrophysics of Galaxies
Galaxy
COLLISIONAL EXCITATION
Interstellar medium
Physics and Astronomy
Space and Planetary Science
GAS
Astrophysics of Galaxies (astro-ph.GA)
Astrophysics::Earth and Planetary Astrophysics
Subjects
Details
- Language :
- English
- ISSN :
- 00358711 and 13652966
- Database :
- OpenAIRE
- Journal :
- MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
- Accession number :
- edsair.doi.dedup.....4e682c1f0d90c250a8314d7dc89f033b