Publication Abstracts
De Vries et al. 1987
De Vries, H.W., A. Heithausen, and P. Thaddeus, 1987: Molecular and atomic clouds associated with infrared cirrus in Ursa Major. Astrophys. J., 319, 723-729, doi:10.1086/165492.
Observations of CO and H I revealed that in Ursa Major the high-latitude far-infrared "cirrus" emission discovered by the Infrared Astronomical Satellite comes from molecular and atomic clouds. These clouds differ sufficiently from the large clouds in the Galactic plane so that the ratio of H2 column density to velocity-integrated CO radiation temperature, N(H2)/W(CO), derived from Galactic plane surveys, may not apply to them. On the assumption of a constant gas-to-dust ratio, it is argued that the cirrus emission in Ursa Major is a good mass tracer, since both the atomic and the molecular gas are probably optically thin at visual wavelengths, and the grains are heated not by local sources but by the background field of Galactic starlight. The N(H2)/W(CO) ratio thus derived for those diffuse clouds, (0.5±0.3)×1020 K-1km-1s/cm2, is significantly lower than the ratio applicable to Galactic plane surveys.
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BibTeX Citation
@article{de04300u,
author={de Vries, H. W. and Heithausen, A. and Thaddeus, P.},
title={Molecular and atomic clouds associated with infrared cirrus in Ursa Major},
year={1987},
journal={Astrophysical Journal},
volume={319},
pages={723--729},
doi={10.1086/165492},
}
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RIS Citation
TY - JOUR ID - de04300u AU - de Vries, H. W. AU - Heithausen, A. AU - Thaddeus, P. PY - 1987 TI - Molecular and atomic clouds associated with infrared cirrus in Ursa Major JA - Astrophys. J. JO - Astrophysical Journal VL - 319 SP - 723 EP - 729 DO - 10.1086/165492 ER -
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