ISSN:
1572-946X
Source:
Springer Online Journal Archives 1860-2000
Topics:
Physics
Notes:
Abstract The results of computing the evolution of a disk subsystem of a spiral galaxy taking into account radial gradients of chemical elements (D,4He,12C,13C,14N,16O,7Li, Fe) are presented. It is shown that flow of intergalactic matter accreting on to the galaxy results in smoothing the radial gradients of gas and chemical elements, especially at the latest stage of the evolution. The final gradients depend weakly on the age of the galaxy and value of the Hubble constanth. The best agreement between calculated and observed abundance of4He is revealed if the primordial yield isY 0=0.25. The small decrease of the primordial deuterium abundance confirms the conclusion that the baryon density parameter is small: Ω b h 50 2 ≤1. Therefore, the nature of dark matter should be non-baryonic.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00644851
Permalink