Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...346..101c&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 346, Nov. 1, 1989, p. 101-107.
Astronomy and Astrophysics
Astrophysics
18
Angular Momentum, Disk Galaxies, Galactic Evolution, Galactic Mass, Galactic Rotation, Astronomical Models, Density Distribution, Metallicity, Monte Carlo Method, Spin Dynamics, Stellar Mass, Supernovae
Scientific paper
Violent conditions in young spiral disks may be conducive to the high-velocity ejection of large 'blobs' of material powered by the concerted action of supernovae. Using explicit numerical Monte Carlo models, treating ejected 'bobs' as 'galactic cannonballs' traveling with little interaction through the corona, several important consequences for galactic evolution are found. Preferential escape from the galaxy or objects with high specific angular momenta lead to a significant spin-down of the disk. In addition, this process may contribute to the production of an exponential column density distribution, and a metallicity gradient. The models predict a reversal in the sign of the metallicity gradient at large radii because the metal-rich objects that return to such a low column density region suffer relatively little dilution.
Charlton Jane C.
Salpeter Edwin E.
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