Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...229...37b&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 229, no. 1, March 1990, p. 37-46.
Astronomy and Astrophysics
Astrophysics
19
Density Wave Model, Galactic Structure, Spiral Galaxies, Color, Density Distribution, Luminosity, Shock Fronts, Star Formation
Scientific paper
A set of parameters to characterize azimuthal profiles of galaxies is proposed and applied to the spiral structure of the galaxies NGC 1832 and NGC 7479 observed in the B and I passbands. Interpretations of the observations in terms of the two most widely discussed theories of star formation, the spiral density wave theory and that of self-stochastic propagation of star formation, are considered. NGC 7479, with well defined arms, seems to maintain a leading density wave; evidence is presented for a phase separation in the B and I bands corresponding to star formation stimulated by the passage of the wave. NGC 1832, with more flocculent spiral arms, presents a more confused interpretational pattern.
Beckman John E.
Cepa Jordi
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