Astronomy and Astrophysics – Astrophysics
Scientific paper
Feb 1984
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984a%26a...131..367s&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 131, no. 2, Feb. 1984, p. 367-374. In German.
Astronomy and Astrophysics
Astrophysics
11
Galactic Structure, Spiral Galaxies, Astronomical Photography, Density Wave Model, Digital Data, Image Processing, Pattern Recognition, Stellar Evolution
Scientific paper
Subjective criteria play a more important part in studies of galaxies than in other areas of astrophysics. Problems arise in connection with the determination of the pitch angle. This parameter represents a crucial quantity for each theory of the spiral structure. A determination of the pitch angle on the basis of a procedure which is as objective as possible can, therefore, make a contribution towards a decision with respect to the competing theories of the spiral structure. The present investigation is concerned with such a determination. The digitizing of galaxy images on the Schmidt plates of the ESO(B) Survey is discussed, and an objective determination of the pitch angle is described. The two competing theories regarding spiral formation, including the density wave theory reported by Lin et al. (1969) and the concept of stochastic self propagating star formation considered by Gerola and Seiden (1978), are evaluated on the basis of the obtained pitch angle data. It is found that the agreement between theory and empirical data is significantly more satisfactory in the case of the concept of stochastic star formation.
Musculus D.
Schlosser Wolfgang
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