Reduction of chemical networks. I. The case of molecular clouds

Details Reduction of chemical networks. I. The case of molecular clouds Reduction of chemical networks. I. The case of molecular clouds

2002-12-04

arxiv.org/abs/astro-ph/0212096v1

Astron.Astrophys.399:197-210,2003

Astronomy and Astrophysics

Astrophysics

15 pages, 7 postscript figures, accepted for publication in A&A

Scientific paper

10.1051/0004-6361:20021773

We present a new method to analyse and reduce chemical networks and apply this technique to the chemistry in molecular clouds. Using the technique, we investigated the possibility of reducing the number of chemical reactions and species in the UMIST 95 database simultaneously. In addition, we did the same reduction but with the ``objective technique'' in order to compare both methods. We found that it is possible to compute the abundance of carbon monoxide and fractional ionisation accurately with significantly reduced chemical networks in the case of pure gas-phase chemistry. For gas-grain chemistry involving surface reactions reduction is not worthwhile. Compared to the ``objective technique'' our reduction method is more effective but more time-consuming as well.

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