Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1977
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1977apj...217...71b&link_type=abstract
Astrophysical Journal, Part 1, vol. 217, Oct. 1, 1977, p. 71-77. Research supported by the Statens Naturvetenskapliga Forskning
Astronomy and Astrophysics
Astrophysics
17
Electromagnetic Scattering, Formaldehyde, Interstellar Chemistry, Interstellar Radiation, Nebulae, Radiative Transfer, Abundance, Anisotropic Media, Astronomical Models, Density Distribution, Mathematical Models, Photodissociation, Radiant Flux Density, Ray Tracing, Ultraviolet Radiation
Scientific paper
The ray-tracing technique for solving radiative-transfer problems in spherical symmetry is used to develop a procedure for determining the radiation intensity in models of dark clouds exposed to the interstellar radiation field and/or to radiation from embedded stars. To this end, a source function that includes anisotropic scattering has been derived. By studying models of the Rho Ophiuchi cloud complex, it is found that higher opacities than those implied by star counts are necessary if photodissociation of formaldehyde by interstellar radiation in the outer parts of the cloud is not to occur. Furthermore, an increased excitation temperature or a high rate of photodissociation, or a combination thereof, may be the cause of the 6-cm H2CO line intensity decrease observed at the position of an embedded star cluster.
Bernes C.
Sandqvist Aa
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