Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992apj...401..182d&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 401, no. 1, p. 182-195.
Astronomy and Astrophysics
Astrophysics
7
Hydrodynamics, Interstellar Gas, Molecular Clouds, Ultraviolet Radiation, Computerized Simulation, Gravitational Effects, Interstellar Extinction, Radiation Distribution, Stellar Envelopes
Scientific paper
Aspects of the dynamics of intermediate-density atomic and molecular gas illuminated by a nonuniform UV radio field are examined. The formation of gas condensation and the development of a large-scale velocity field in shielded regions are studied in a 2D hydrodynamical calculation. Considering the UV intensity map as a parameter and performing the calculations with a Gaussian profile of the UV attenuation and an attenuation factor of 20 at maximum relative to the standard UV intensity leads to a one order of magnitude condensation achieved through a density wave comoving with the UV perturbation. The gas flows through the wave with rest-frame velocities of 0.3-0.8 km/s. Complementary solutions are performed which show the velocity field generated by successive passages of random UV perturbations.
Chieze Jean Pierre
de Boisanger C. B.
Meltz B.
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