Is IRAS cirrus cloud emission largely fine-structure radiation?

Details Is IRAS cirrus cloud emission largely fine-structure radiation? Is IRAS cirrus cloud emission largely fine-structure radiation?

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986natur.319..646h&link_type=abstract

Nature (ISSN 0028-0836), vol. 319, Feb. 20, 1986, p. 646, 647.

Astronomy and Astrophysics

Astronomy

17

Cirrus Clouds, Emission Spectra, Fine Structure, Line Spectra, Galactic Radiation, Infrared Astronomy Satellite

Scientific paper

One of the more interesting observations made by the infrared astronomical satellite (IRAS) mission is the discovery of a diffuse 'cirrus' component seen at 60 and 100 μm. It straddles the galactic plane and extends, in patches, to latitudes of ±80°. Comparison of the observed brightness from these clouds with [O I] 63-μm and [O III] 88-μm fine-structure line emission, calculated on the basis of observed [C II] emission from the galactic plane, shows the flux levels observed by IRAS to be of the same order as the expected fine-structure line emission. The authors propose that fine-structure line emission, from neutral gas at 63 μm and from diffuse ionized clouds at 88 μm, is a significant component and in some clouds perhaps the prime source of the cirrus radiation.

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