Other
Scientific paper
Oct 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...345..697k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 345, Oct. 15, 1989, p. 697-706.
Other
16
Cosmic Dust, Galactic Structure, Interstellar Matter, Molecular Gases, Spiral Galaxies, Carbon Monoxide, Hydrogen Clouds, Interstellar Gas, Shock Fronts
Scientific paper
The dust lanes in M81 are analyzed to obtain high-resolution information about the distribution of molecular gas and to determine how the dust lanes are related to other tracers of spiral structure. It is concluded that the dust filaments are composed mainly of molecular gas, and that many appear to be clouds 100-200 pc above the midplane. Although a few short dust filaments are located near the H I velocity shock front, these have neither greater length nor greater extinction than the filaments farther downstream. The dust filaments with the high internal extinction often abut the upstream and downstream edges of giant H II region complexes. Half of the dust filaments show an alignment suggestive of a global instability produced by galactic shear.
Bash Frank N.
Elmegreen Debra Meloy
Kaufman Michele
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