Astronomy and Astrophysics – Astrophysics
Scientific paper
Nov 1981
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981ap%26ss..80..173a&link_type=abstract
Astrophysics and Space Science, vol. 80, no. 1, Nov. 1981, p. 173-187. Research supported by the Consiglio Nazionale delle Rice
Astronomy and Astrophysics
Astrophysics
2
Far Ultraviolet Radiation, Formaldehyde, Interstellar Chemistry, Interstellar Matter, Molecular Clouds, Radiative Transfer, Interstellar Radiation, Photodissociation, Photoionization, Radiation Distribution
Scientific paper
Using the method of successive scatterings, the UV radiation transfer within spherical interstellar dust clouds is analyzed. The results are then used to determine the lifetime of interstellar H2CO molecules against photodestruction. It is found that in a dense interstellar cloud with the assumed dust composition the effectiveness of photodissociation in destroying H2CO is always lower than, or comparable with, the effectiveness of chemical mechanisms, provided the chemical composition is similar to that found in the models proposed by Mitchell et al. (1978). It is noted that this fact could lessen somewhat the constraints on formation rates of H2CO in deeper regions of interstellar clouds.
Aiello Santi
Morbidelli L.
Ulivi Lorenzo
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