Spiral arms of galaxies - their photometric and color profiles and the mass problem.
Abstract
The spiral arms of galaxies have been modelled by a young stellar component with prolonged and symmetrical star formation rate. Such a star formation rate allows to explain observed broad symmetrical profiles of spiral arms. Theoretical color and luminosity profiles are presented and the influence of star formation in the model spiral arms on the disk luminosity and colors is considered. The problem of large density enhancement of disk population in spiral arms is also discussed and it has been shown that the red colors of spiral arms discovered by some observers can be assigned to a number of other effects, not necessarily to density waves of large amplitudes in the disk population.
- Publication:
-
Publications of the Tartu Astrofizica Observatory
- Pub Date:
- 1986
- Bibcode:
- 1986PTarO..51..181T
- Keywords:
-
- Colors:Galaxies;
- Galaxies:Colors;
- Galaxies:Luminosities;
- Galaxies:Spiral Arms;
- Galaxies:Star Formation;
- Luminosities:Galaxies;
- Spiral Arms:Galaxies;
- Star Formation:Galaxies