Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...305..602a&link_type=abstract
Astronomy and Astrophysics, v.305, p.602
Astronomy and Astrophysics
Astrophysics
120
Ism: Molecules, Molecular Processes, Ultraviolet: Ism
Scientific paper
We have developed a model for interstellar polycyclic aromatic hydrocarbons (PAHs) in order to estimate their rate of photodissociation in the interstellar medium. These photo-reactions include the loss of atomic and molecular hydrogen and the loss of the acetylene molecule. We have studied the stability of PAHs in the regions of high UV radiation where the infrared emission bands attributed to PAHs are observed (reflection nebulae, planetary nebulae, active galactic nuclei, HII regions...) by comparing the rate of acetylene loss to the rate of accretion of carbon to PAHs. This comparison shows that only PAHs with more than 50 carbon atoms may survive the UV radiation field of these regions, whereas smaller PAHs such as coronene or ovalene are destroyed within a few years.
Allain T.
Leach Samuel
Sedlmayr Erwin
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