Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...247..488b&link_type=abstract
Astrophysical Journal, Part 1, vol. 247, July 15, 1981, p. 488-498.
Astronomy and Astrophysics
Astrophysics
28
Density Wave Model, Galactic Structure, Interstellar Matter, Molecular Clouds, Star Formation, Stellar Motions, B Stars, Ballistics, Brightness, Carbon Monoxide, Color, H Ii Regions, O Stars, Particle Motion, Spiral Galaxies, Stellar Mass, Stellar Spectrophotometry, Ubv Spectra
Scientific paper
The two-armed spiral shock wave, fitted to observations of the H I gas in M81 by Visser (1978), is used to give initial conditions for ballistic particles launched from the spiral arms. The location of molecular clouds is predicted, and agrees with a detection of CO in M81 and with the observed distribution of H II regions near the eastern arm. Arm colors, and differences between H II regions and molecular clouds are also predicted, with the colors agreeing best when a linear density wave amplitude near the observed amplitude is used. A galaxy resembling a photograph of M81 is also produced, and limitations and consequences of the model are discussed. It is concluded that the spiral-arm star formation does not make any low mass stars, or that low-mass stars are hidden or not yet formed when the O and B stars are shining, and formation in spiral galaxies must be described by at least two initial mass functions.
Bash Frank N.
Visser C. D. H.
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