Mathematics – Logic
Scientific paper
Apr 1979
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979apj...229...91t&link_type=abstract
Astrophysical Journal, Part 1, vol. 229, Apr. 1, 1979, p. 91-110.
Mathematics
Logic
96
Astronomical Photometry, Density Wave Model, Galactic Radiation, Galactic Structure, Spiral Galaxies, Ubv Spectra, Brightness Temperature, Galactic Evolution, Graphs (Charts), Stellar Evolution, Tables (Data)
Scientific paper
UBVR surface photometry of the bright southern spiral galaxy NGC 5236 (M83) is presented. Calibrated maps of UBVR and H-alpha surface brightness and colors are compared with models of evolving mixes of stellar populations in order to establish a measurable drift velocity relative to some feature for the young associations supposedly formed in the wake of a spiral density wave. The color and morphological information is used to remove the effects of recent star formation from the radial profile of surface brightness. A search for systematic color gradients across and behind the spiral arms reveals no systematic gradient within the arms and no significant gradients behind the arms in those regions completely free of stars less than 50 million years old. The lack of a systematic color gradient within the arms is shown to be in agreement with expectations from density-wave theory when proper allowance is made for noncircular orbits and imperfect synchrony of star formation.
Dufour Reginald James
Jensen E. B.
Talbot Raymond J. Jr.
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