Grain photoelectric ionisation rates, heating rates, and charge as functions of visual extinction

Details Grain photoelectric ionisation rates, heating rates, and charge as functions of visual extinction Grain photoelectric ionisation rates, heating rates, and charge as functions of visual extinction

Jan 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004a%26a...413....1r&link_type=abstract

Astronomy and Astrophysics, v.413, p.1-5 (2004)

Astronomy and Astrophysics

Astrophysics

4

Astrochemistry, Ism: Dust, Extinction

Scientific paper

Recombination onto grain surfaces is important in determining the fractional ionisation and the depletions of elements. The recombination rates of ions depend on the grain charges. We calculate the dependence of the grain charge distribution function on visual extinction for each of a number of cloud models in order to obtain the mean grain charge as a function of visual extinction. We give simple fits to the dependences on grain charge and visual extinction of photoionisation and photoelectric heating rates which may be used in the modelling of photon dominated regions.

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