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The Case for Thermalization as a Contributor to the [CII] Deficit

Authors :
Alberto D. Bolatto
Eric W. Pelligrini
Jessica Sutter
George Helou
Maud Galametz
Leslie K. Hunt
Kevin V. Croxall
Karin Sandstrom
Brent Groves
J. D. T. Smith
Daniel A. Dale
Christine D. Wilson
Rodrigo Herrera-Camus
Robert C. Kennicutt
Mark G. Wolfire
Médéric Boquien
Ilse De Looze
Daniela Calzetti
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

Details

Language :
English
ISSN :
00358711 and 13652966
Database :
OpenAIRE
Journal :
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Accession number :
edsair.doi.dedup.....4e682c1f0d90c250a8314d7dc89f033b