Astronomy and Astrophysics – Astronomy
Scientific paper
Jun 1997
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997apj...482..866d&link_type=abstract
Astrophysical Journal v.482, p.866
Astronomy and Astrophysics
Astronomy
14
Radiation Mechanisms: Nonthermal, Ism: Clouds, Ism: Dust, Extinction, Ism: Reflection Nebulae
Scientific paper
The observation of filamentary extended red emission (ERE) structures in reflection nebulae is found to be consistent with the establishment of an equilibrium between the deactivation of small grains of hydrogenated amorphous carbon (HAC) by UV radiation and rehydrogenation by H atoms created by photodissociation of H2 by the same UV field. Laboratory data on photodarkening and H-atom rehydrogenation rates in HAC have been used to provide a quantitative prediction of emission rates for comparison with ERE intensities. Quantitative agreement is obtained between calculated and observed ERE intensities in reflection nebulae. The luminescence efficiency of interstellar HAC is found to be similar (10-2--10-3) to that measured for laboratory samples. ERE is calculated to occur from a region with a linear dimension Delta z ~ (1--2) x 1017 cm at the edge of a photodissociation zone. Proper motion of these emission regions may be detectable.
Duley Walter W.
Seahra Sanjeev S.
Williams David. A.
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