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Surface photometry of spiral galaxies. I - Theoretical color variation and surface brightness across spiral armsA method for the construction of color variations and surface brightness across a galactic spiral arm, using the concepts and results of the density-wave theory, is developed. The color variation measured by the index Q varies with the ratio of the light of young stars to that of the old stars, the initial mass function, and the pattern speed. The fact that the variation of brightness and color across a spiral arm is relatively smooth and symmetrical and not sharp as in the galactic shock picture is due to the smearing-out effects of star formation inside a cloud in the regions behind the galactic shock, and the tendency of new stars to fall back to small galactocentric distances after their formation because of their lower angular velocity at birth. Both effects arise naturally in the context of the density-wave theory.
Document ID
19810042303
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Yuan, C.
(City College New York, N.Y., United States)
Grosbol, P.
(University Observatory Copenhagen, Denmark)
Date Acquired
August 11, 2013
Publication Date
January 15, 1981
Publication Information
Publication: Astrophysical Journal
Subject Category
Astrophysics
Accession Number
81A26707
Funding Number(s)
CONTRACT_GRANT: NSG-2348
Distribution Limits
Public
Copyright
Other

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