Statistics – Computation
Scientific paper
Sep 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989mnras.240..373p&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 240, Sept. 15, 1989, p. 373-395.
Statistics
Computation
28
Chemical Evolution, Cosmochemistry, Galactic Evolution, Radial Velocity, Stellar Motions, Abundance, Accretion Disks, Astronomical Models, Computational Astrophysics, Gas Dynamics, Halos
Scientific paper
Inconsistencies in recent models of galactic chemical evolution with infall are pointed out. It is noted that matter accreted by a disk is unlikely to possess the correct angular momentum for circular orbit at the radius where it is accreted. It is shown that if the total amount of accreted matter is substantial, the gravitational field of the galaxy changes, leading to shrinkage of the disk. The evolution of disks sitting in a massive halo is investigated, with special attention being given to the effects of infall on galactic abundance gradients. The most significant effects are found early in the formation of the disk, particularly in its outer regions where it is not possible for a smooth adjustment to centrifugal balance to occur with slow radial motions.
Pitts E.
Tayler Roger John
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