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Chemical evolution of the galactic disk with radial gas flows

Lacey, C.G.; Fall, S.M.

Chemical evolution of the galactic disk with radial gas flows Thumbnail


S.M. Fall


Models are presented for the chemical evolution of the galactic disc with radial inflows of the gas at a velocity constant with time, but that may vary with the galactocentric radius. The models include the infall of metal-free gas from outside the disc at a rate decaying exponentially with time, a star formation rate that varies as the surface density of the gas layer to the power of m, with m = 1 or 2, and in some cases an outer edge to the stellar disc at the star formation cutoff radius. The models are compared with the observed age-metallicity relation and metallicity distribution for stars in the solar neighborhood and with the observed radial variations of the metallicity, the star formation rate, and the surface densities of the gas and stars. Inflow velocities of approximately -(0.5-1.0) km/s are expected.


Lacey, C., & Fall, S. (1985). Chemical evolution of the galactic disk with radial gas flows. Astrophysical Journal, 290, 154-170.

Journal Article Type Article
Publication Date Mar 1, 1985
Deposit Date Mar 27, 2015
Publicly Available Date Apr 2, 2015
Journal Astrophysical Journal
Print ISSN 0004-637X
Electronic ISSN 1538-4357
Publisher American Astronomical Society
Peer Reviewed Peer Reviewed
Volume 290
Pages 154-170
Related Public URLs


Published Journal Article (475 Kb)

Copyright Statement
© 1985. The American Astronomical Society. All rights reserved . Printed in U.S.A.

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