The colour gradient in M 31 - Evidence for disc formation by biased infall?

Details The colour gradient in M 31 - Evidence for disc formation by biased infall? The colour gradient in M 31 - Evidence for disc formation by biased infall?

Feb 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...255..105j&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 255, no. 1-2, p. 105-114.

Astronomy and Astrophysics

Astrophysics

14

Galactic Bulge, Galactic Evolution, Galactic Structure, Interstellar Chemistry, Metallicity, Astronomical Models, Astronomical Photometry, Star Distribution, Star Formation, Stellar Color

Scientific paper

The evolutionary population synthesis model of Arimoto and Yoshii (1986) is used to investigate the chemical and photometric evolution of galactic disks which form by prolonged infall of halo material on a timescale that increases with radius (biased infall). It is found that the decline in the mean age and metallicity of the stellar population with radius generates significant color gradients in the disk. The model is applied to M 31, in which strong radial color gradients were observed. It is found that the chemical and photometric properties of M 31 can be largely accounted for if its disk formed on a timescale that increased from 0.7 Gyr at the center to 5 Gyr at a radius of 10 kpc.

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