Abstract
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.
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