The Radial Gradient of Heavy-Element Abundances in Disk Galaxies

Details The Radial Gradient of Heavy-Element Abundances in Disk Galaxies The Radial Gradient of Heavy-Element Abundances in Disk Galaxies

Nov 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001arep...45..854w&link_type=abstract

Astronomy Reports, Volume 45, Issue 11, November 2001, pp.854-860

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Various origins for the formation of the heavy-element abundance gradients observed in nearly all disk galaxies are analyzed in the framework of evolutionary models. In an isolated galaxy, there is a radial gradient of the abundance of heavy elements only early in its evolution (the first several billion years), which subsequently practically disappears. The gradients of chemical compositions of young objects and the interstellar gas require that typical disk galaxies be open systems (i.e., that they eject some heavy elements into circumgalactic space and/or accrete intergalactic gas) and that the rates of both processes be dependent on galactocentric distance.

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