Chemical evolution of disk galaxies - Self-consistent structure of the disk

Details Chemical evolution of disk galaxies - Self-consistent structure of the disk Chemical evolution of disk galaxies - Self-consistent structure of the disk

Sep 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989rmxaa..18..145m&link_type=abstract

(Universidad Nacional Autonoma de Mexico and CONACYT, Conferencia Mexicana-Texana de Astrofisica, 2nd, Mexico City, MX, Feb. 22-

Other

19

Chemical Evolution, Disk Galaxies, Galactic Structure, Interstellar Gas, Self Consistent Fields, Star Formation, Abundance, Galactic Mass, Gas Density, Gas Pressure, Gravitational Fields, Stellar Gravitation, Stellar Models

Scientific paper

Assuming that both the star formation rate and the gas velocity dispersion in a disk galaxy are regulated by the stellar energy injection, a self-consistent chemical evolution model can be constructed. The star formation rate and the disk thickness are no longer free parameters, but they are controlled by the feedback between gas and stars. Given that the gas pressure is a function of the gravitational field, such a feedback results in a star formation rate that is also dependent on the total mass surface density. Preliminary results are presented for the Milky Way, assuming that the galactic mass grows by primordial infall and that the gas relaxes to an isothermal disk in hydrostatic equilibrium. The observed elemental gradients, the age-metallicity relation for the solar neighborhood, the G-dwarf chemical distribution, and the present day disk surface gas density distribution, are reasonably well reproduced by the model.

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