Effect of the infall of matter on the dynamical structure and chemical evolution of a spiral galaxy

Details Effect of the infall of matter on the dynamical structure and chemical evolution of a spiral galaxy Effect of the infall of matter on the dynamical structure and chemical evolution of a spiral galaxy

May 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981a%26a....98....1m&link_type=abstract

Astronomy and Astrophysics, vol. 98, no. 1, May 1981, p. 1-8.

Astronomy and Astrophysics

Astrophysics

68

Chemical Evolution, Galactic Evolution, Galactic Structure, Gas Dynamics, Mass Transfer, Spiral Galaxies, Angular Momentum, Astronomical Models, Asymmetry, Disk Galaxies, Milky Way Galaxy

Scientific paper

The dynamical consequences of the accretion of matter onto the gaseous disks of spiral galaxies have been studied. On the hypothesis of zero angular momentum for the matter falling onto the disk, we have estimated the asymmetries introduced in the gas distribution and its velocity. An accretion rate of 1 Msun/year is sufficient to account for the order of magnitude of the velocity asymmetries observed between the Northern and Southern rotation curves of the Galaxy as well as major asymmetries observed in the gas distributions of certain spiral galaxies. Moreover it is shown that the radial flux of gas cannot be ignored in models of galactic chemical evolution with accretion of matter. There is incompatibility between 1-zone chemical evolution models and the hypothesis of inf all. A chemical evolution model which takes into account the radial motion driven by a zero angular momentum inf all onto the disk can reproduce very satisfactorily the main observed radial features of our Galaxy.

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