Chemical evolution of a disk galaxy with infall of extragalactic matter

Details Chemical evolution of a disk galaxy with infall of extragalactic matter Chemical evolution of a disk galaxy with infall of extragalactic matter

Mar 1979

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1979mmsai..50..157m&link_type=abstract

(Workshop on Chemical Inhomogeneities in the Galaxy, Frascati, Italy, May 29-June 2, 1978.) Società Astronomica Italiana, Memori

Physics

3

Chemical Evolution, Disk Galaxies, Galactic Evolution, Gravitational Effects, Intergalactic Media, Astronomical Models, Hydrodynamics, Interstellar Gas, Matter (Physics), Perturbation Theory, Rotating Disks

Scientific paper

The hydrodynamical perturbations of a galactic disk subject to infall of extragalactic matter at a rate of about 1 solar mass/yr is estimated. The cases of pole-on infall and oblique infall onto a rotating disk are examined, and consequences of such infall for chemical evolution are considered. It is shown that a one-zone model of chemical evolution is incompatible with infall of extragalactic matter, that the contraction of a gaseous disk associated with conservation of angular momentum will result in migration of heavy elements toward the center of the galaxy, and that this migration will facilitate the formation of a radial chemical gradient.

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