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Observation of forbidden C II 158 micron emission from the diffuse interstellar medium at high Galactic latitude

Bock, J. J., Hristov, V. V., Kawada, M., Matsuhara, H., Matsumoto, T., Matsuura, S., Mauskopf, Philip Daniel, Richards, P. L., Tanaka, M. and Lange, A. E. 1993. Observation of forbidden C II 158 micron emission from the diffuse interstellar medium at high Galactic latitude. Astrophysical Journal Letters 410 (2) , L115-L118. 10.1086/186893

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Abstract

We report the first detection of forbidden C II 158 micron line emission from the diffuse interstellar medium at high Galactic latitude. We have measured the integrated line intensity in a 36 arcmin field of view along a triangular scan path in a 5 x 20 deg region in Ursa Major using a rocket-borne, liquid-helium-cooled spectrophotometer. The scan included high-latitude infrared cirrus, molecular clouds, a bright external galaxy, M82, and the H I Hole, which is a region of uniquely low neutral hydrogen column density. Emission from forbidden C II is observed in all regions, and, in the absence of appreciable CO emission, it is well correlated with neutral hydrogen column density. We observe a forbidden C II gas cooling rate which varies from (1.18 +/- 0.4 to 3.25 +/- 0.8) x 10 exp -26 ergs/s/H atom. Regions with CO emission have enhanced forbidden C II line emission over that expected from the correlation with neutral hydrogen column density. We measure a line-to-continuum ratio which varies from 0.002 to 0.008 in comparison with the all-sky average of 0.0082 reported by FIRAS, which is heavily weighted toward the Galactic plane.

Item Type: Article
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: IOP Science
ISSN: 0004-637X
Last Modified: 04 Jun 2017 05:05
URI: http://orca-mwe.cf.ac.uk/id/eprint/48228

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