Statistics – Computation
Scientific paper
Nov 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...363..488k&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 363, Nov. 10, 1990, p. 488-498. Research supported by the Robert A. Welch F
Statistics
Computation
87
Galactic Evolution, Globular Clusters, Shock Waves, Active Galactic Nuclei, Computational Astrophysics, Early Stars, Gravitational Effects, Ultraviolet Radiation, X Ray Sources
Scientific paper
The thermal history of metal-free gas overtaken by radiative shocks with velocities characteristic of gravitationally induced motions inside a typical protogalaxy is studied. This is relevant to suggestions that globular clusters formed within protogalaxies in the compressed gas resulting from such shocks or from a thermal instability. Solutions are obtained for the hydrodynamical equations, along with the rate equations for nonequilibrium ionization, recombination, molecular formation and dissociation, and the equations of radiative transfer for steady-state shocks of velocity 300 km/s in a gas of preshock density 0.1-1/cu cm. It is suggested that the formation of globular clusters is a threshold effect, with the intensity of the UV/soft X-ray field in a protogalaxy as the controlling factor.
Fall Michael S.
Kang Hyesung
Rees Martin J.
Shapiro Paul R.
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