Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004mnras.352..600r&link_type=abstract
Monthly Notices of the Royal Astronomical Society, Volume 352, Issue 2, pp. 600-604.
Astronomy and Astrophysics
Astronomy
12
Astrochemistry, Molecular Processes, Ism: Molecules
Scientific paper
In an earlier paper (Charnley & Rodgers), we demonstrated that gas-phase chemistry in selectively depleted interstellar cores and/or protostellar discs can lead to significant 15N enhancements. Recent laboratory measurements of the electron dissociative recombination of N2H+ show that this reaction is able to break the N-N bond and so will release nitrogen atoms and NH radicals into the gas at a much faster rate than previous models have assumed. We have assessed the importance of this new result for the 15N chemistry and find that the reaction acts to reduce the degree of 15N enhancement. We discuss two modifications to our original model that each allow the high 15N/14N ratios to be recovered: N2 H+ recombination on polycyclic aromatic hydrocarbon (PAH) molecules and a small barrier in the N + NH reaction. We find that higher 15N/14N ratios can be produced in this revised model. Some observational consequences of these are outlined.
Charnley Steven B.
Rodgers S. D.
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