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Observation of [CII] 158 μm emission from the diffuse interstellar medium

Bock, J., Hristov, V. V., Mauskopf, Philip Daniel, Richards, P. L., Lange, A. E., Kawada, M., Matsuhara, H., Matsuura, S., Tanaka, M. and Matsumoto, T. 1992. Observation of [CII] 158 μm emission from the diffuse interstellar medium. Presented at: Back to the Galaxy, College Park, MD, 12−14 Oct 1992. Back to the Galaxy: College Park, MD, 1992 (AIP Conference Proceedings ). AIP Conference Proceedings Melville, NY: American Institute of Physics, pp. 299-302. 10.1063/1.43991

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We report the first direct detection of 158 μm [CII] line emission from the diffuse interstellar medium at high galactic latitude. We measured the integrated line intensity in a 36' field-of-view along a triangular scan in a 5°×20° region in Ursa Major using a rocket-borne, liquid helium cooled spectrophotometer. The scans included high latitude infrared cirrus, molecular clouds, a bright external galaxy, M82, and the HI Hole, a region of uniquely low neutral hydrogen column density. Emission from [CII] is observed in all regions, and in the absence of CO emission it is well correlated with neutral hydrogen column density. We deduce a [CII] gas cooling rate of (2.6+/-0.6)×10-26 ergs s-1 H-atom-1, in good agreement with a recent observation of UV absorption lines at high galactic latitude.

Item Type: Conference or Workshop Item (Paper)
Date Type: Publication
Status: Published
Schools: Physics and Astronomy
Subjects: Q Science > QB Astronomy
Publisher: American Institute of Physics
ISBN: 9781563962271
ISSN: 0094-243X
Last Modified: 04 Jun 2017 07:58

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