The color gradient in spiral galaxies - Application to M 81

Details The color gradient in spiral galaxies - Application to M 81 The color gradient in spiral galaxies - Application to M 81

May 1975

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1975a%26a....40..401s&link_type=abstract

Astronomy and Astrophysics, vol. 40, no. 4, May 1975, p. 401-404. Research supported by the Nederlandse Organisatie voor Zuiver

Astronomy and Astrophysics

Astrophysics

11

Color, Galactic Evolution, Spiral Galaxies, Star Clusters, Stellar Evolution, Angular Velocity, Gas Density, Interstellar Extinction, Mass Distribution

Scientific paper

The calculated development of the color of a star cluster (Searle et al., 1973) is used to predict the expected color evolution, as a function of radius, in a spiral galaxy. It is assumed that the fraction of gas which is converted into stars during a spiral arm passage (consumption fraction) is a function of radius only. Applying this model to M 81, it is shown that the observed color and mass distributions can be explained by an initial disk-like gas distribution proportional to the inverse square of the radius and a consumption fraction which is an increasing function of radius.

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