Bock, J. J., Hristov, V. V., Kawada, M., Matsuhara, H., Matsumoto, T., Matsuura, S., Mauskopf, Philip Daniel  ORCID: https://orcid.org/0000-0001-6397-5516, 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
|
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: | 24 Oct 2022 11:28 |
| URI: | https://orca.cardiff.ac.uk/id/eprint/48228 |
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