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

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

Jun 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993apj...410l.115b&link_type=abstract

Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 410, no. 2, p. L115-L118.

Astronomy and Astrophysics

Astrophysics

36

Carbon, Diffuse Radiation, Emission Spectra, Interstellar Matter, Molecular Clouds, Carbon Monoxide, Hydrogen Clouds, Interstellar Radiation

Scientific paper

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.

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