Evolution of galaxies - One-zone model with a birth-rate stellar function depending on gas density and temperature

Details Evolution of galaxies - One-zone model with a birth-rate stellar function depending on gas density and temperature Evolution of galaxies - One-zone model with a birth-rate stellar function depending on gas density and temperature

Feb 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986ap%26ss.119..315c&link_type=abstract

Astrophysics and Space Science (ISSN 0004-640X), vol. 119, no. 2, Feb. 1986, p. 315-336. CNR-supported research.

Astronomy and Astrophysics

Astrophysics

5

Astronomical Models, Cosmic Gases, Galactic Evolution, Stellar Evolution, Abundance, Approximation, Big Bang Cosmology, Chemical Evolution, Gas Density, Interstellar Matter, Schmidt Number, Stellar Mass, Supernovae, Temperature Dependence

Scientific paper

'Comoving' closed one-zone models with a birth-rate stellar function depending on gas density and temperature are considered as a zeroth order approximation to thermochemical evolution of galaxies. The models are made first to expand with the universe after recombination, and then the ensuing phases of violent relaxation and rapid contraction are simulated. Based on certain boundary conditions, such as the time-independence of the relative metal abundances, numerical computations performed up to 12 Gy reproduce a whole class of theoretical models, ranging between the limiting cases of a density-dependent birth rate (Schmidt's law) and a temperature-dependent birth rate. The proposed 'universal' birth rate stellar function is consistent with both a dynamical history starting from the initial expansion of protogalaxies, and a morphological sequence which is described (for any given mass) by the amount of angular momentum, at least for what concerns spiral types.

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