Astronomy and Astrophysics – Astronomy
Scientific paper
Feb 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988apj...325..320o&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 325, Feb. 1, 1988, p. 320-341.
Astronomy and Astrophysics
Astronomy
37
Infrared Sources (Astronomy), Interstellar Matter, Molecular Clouds, Star Formation, B Stars, Far Infrared Radiation, Hydrodynamics, Mach Cones, Photographic Plates, Supersonic Speed
Scientific paper
Optical and far-IR studies have been conducted on 14 high Galactic latitude clouds with comet-like or filamentary appearances. Their physical characteristics are deduced and found to be comparable to those of small, low-mass molecular clouds found in the solar neighborhood in recent CO and H I surveys. The morphologies of five of the clouds are found to be consistent with objects moving supersonically through the interstellar medium. These clouds are also active in forming B-type stars in their nuclei where the dynamic pressures are expected to be highest. The filamentary clouds have shapes consistent with subsonic, low Reynolds number hydrodynamics, a feature they may share with the Draco molecular cloud. A simple qualitative scenario is also presented, describing a possible evolutionary link among these clouds as a population.
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