Time evolution of disk galaxies undergoing stochastic self-propagating star formation

Details Time evolution of disk galaxies undergoing stochastic self-propagating star formation Time evolution of disk galaxies undergoing stochastic self-propagating star formation

Feb 1983

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1983apj...265..140f&link_type=abstract

Astrophysical Journal, Part 1, vol. 265, Feb. 1, 1983, p. 140-147. Research supported by the Natural Sciences and Engineering R

Astronomy and Astrophysics

Astrophysics

11

Disk Galaxies, Galactic Evolution, Galactic Structure, Gas Density, Star Formation, Stochastic Processes, Astronomical Models, Interstellar Gas, Radial Distribution, Spiral Galaxies, Star Distribution

Scientific paper

The paper examines models of disk galaxies in which a stochastic self-propagating star formation mechanism is operating. The evolution of the models is followed over a period of 10-billion years, and account is taken of gas depletion due to conversion into stars and of the return of matter to the interstellar medium by evolving stars. Numerical experiments indicate that the evolution of differentially rotating disk galaxies in which the initial distribution of gas is exponential and where the stochastic self-propagating star formation mechanism is operating proceeds such that the gas distribution flattens out and an exponential disk of low-mass stars is produced. It is shown that the dependence of the fractional gas content of the models on the maximum rotational velocity of the disk is sensitive to the initial gas density distribution. It is also shown that the lifetime is very sensitive to many parameters, including the efficiency of the star formation process, the rates of different star formation mechanisms, and the density distribution of the disk.

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