Observing a Column-Dependent ζ in the Horsehead PDR

Details Observing a Column-Dependent ζ in the Horsehead PDR Observing a Column-Dependent ζ in the Horsehead PDR

Jun 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010mss..confefc09r&link_type=abstract

"International Symposium On Molecular Spectroscopy, 65th Meeting, Held 21-25 June, 2010 at Ohio State University. http://molspec

Astronomy and Astrophysics

Astronomy

Astronomical Species And Processes

Scientific paper

The molecules CCH, C_4H, HCO^+, and HC_3N have been observed at the edge of the Horsehead Nebula in abundances far higher than those predicted by Photodissociation Region (PDR) models.
Using a column-dependent cosmic ray ionization rate (ζ), we model the edge of the Horsehead Nebula as a one-dimensional nearly-``edge-on'' heterogeneous PDR with temperature ranging from 15-250 K, number density from 10^3 - 5 × 10^5 cm-3, and ζ = 10-16 - 10-14 s-1. The resulting abundances for the molecules listed above are much closer to the observed abundances. In this talk, we will discuss this method, its results, and the usefulness of incorporating a column-dependent ζ in astrochemical PDR models, especially in the advent of ALMA.
J. Pety et al., A&A 435, 885 (2005)
M. Padovani, D. Galli, A.E. Glassgold, A&A 501, 619 (2009)

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