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- W2102646082 abstract "The high-latitude infrared cirrus detected by IRAS is identified with atomic and molecular clouds. These clouds are small (usually less than 1 sq. deg.) and show weak CO emission. On the basis of a distance of 100 pc they are characterized by a mass of a few solar masses and a radius of about 1 pc. Thermal radiation by dust as a results of heating by the diffuse interstellar radiation field is the most-plausible origin of the cirrus emission at far-infrared wavelengths. On the basis of plausible assumptions regarding the uniformity of both the gas-to-dust ratio and the heating and cooling of the dust, the flux density at 100 {mu}m from regions with low visual extinction should be a good tracer of the gas column density. Indeed, the data show an approximately linear proportionality between N(HI), obtained from 21-cm observations, and I{sub 100} (HI), the flux density from dust associated with HI. If the ratio of column density to flux density in high-latitude molecular clouds is equal to the corresponding relation in atomic ones, a value for the ratio of H{sub 2} column density to CO velocity-integrated radiation temperature may be obtained. Although low-mass clouds may be large in number,more » the fraction of the Galactic molecular mass in the form of these clouds is probably no more than 1%.« less" @default.
- W2102646082 created "2016-06-24" @default.
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- W2102646082 date "1988-01-01" @default.
- W2102646082 modified "2023-09-24" @default.
- W2102646082 title "High-latitude molecular clouds and infrared cirrus" @default.
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