Astronomy and Astrophysics – Astrophysics
Scientific paper
Jul 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...231..372e&link_type=abstract
Astrophysical Journal, Part 1, vol. 231, July 15, 1979, p. 372-383.
Astronomy and Astrophysics
Astrophysics
119
Cosmic Dust, Gravitational Collapse, Interstellar Matter, Spiral Galaxies, Stellar Evolution, Astronomical Models, Density Wave Model, Early Stars, Galactic Structure, H Ii Regions, Hydrogen Ions
Scientific paper
The possibility is considered that there are two types of spiral for each spiral galaxy: an underlying spiral of relatively old stars seen in red and IR photographs and a spiral outlined by H II regions and young bright blue stars. The origin of the first spiral is attributed to large-scale spiral density waves, and the second spiral is identified as a stochastic spiral. It is suggested that there is a physical or causal connection between the two spirals and that dust lanes play the role of intermediary. An analysis is performed which shows that such a model can account for the formation and destruction of giant molecular cloud complexes and for observed spiral structure in one simple unified theory.
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