Other
Scientific paper
Aug 1980
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980apj...239..882t&link_type=abstract
Astrophysical Journal, Part 1, vol. 239, Aug. 1, 1980, p. 882-892. Research supported by the Zaccheus Danial Foundation
Other
25
Density Wave Model, Gravitational Effects, Interstellar Gas, Shock Waves, Spiral Galaxies, Stellar Motions, Temperature Effects, Disk Galaxies, Galactic Structure, Gas Density, Gas Heating, Gas Temperature, Isothermal Processes, Vertical Distribution
Scientific paper
By use of two-dimensional, time-dependent, hydrodynamical calculations, the steady-state vertical gas structure of galactic shocks has been determined. A variety of energy densities of gas, magnetic field, and relativistic cosmic rays was assumed. The midplane shock structure is remarkably similar to that found in one-dimensional calculations, with no significant decrease in shock strength and no sudden vertical motion of the postshock gas. The shocks are straight and nearly perpendicular to the galactic plane for almost any realistic galactic parameters. Two-phase calculations, utilizing a time-dependent model of the heating and cooling of the interstellar medium, show no evidence for so-called accretion fronts. The clouds or high-density regions which form in these calculations are shown to form only in the midplane of the galaxy.
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