Models of H3+ in warm, diffuse, molecular gas in the Galactic centre

Details Models of H3+ in warm, diffuse, molecular gas in the Galactic centre Models of H3+ in warm, diffuse, molecular gas in the Galactic centre

Nov 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rspta.364.3043l&link_type=abstract

Royal Society of London Transactions Series A, vol. 364, Issue 1848, p.3043-3047

Astronomy and Astrophysics

Astrophysics

4

Diffuse Interstellar Medium, H3+, Cosmic Rays, Galactic Centre

Scientific paper

Oka et al. (Oka et al. 2005 Astrophys. J. 632, 882 893) have recently observed a large column density of H3+ in the Galactic centre. In one of the gaseous components, a column density of H3+ in its metastable level (3,3) of approximately 4×1014cm-2 is measured. From the excitation of H3+, they deduce a density below 50cm-3 and a temperature approximately 270K. In this paper, we report results for this region from a new version of our PDR code which includes the H3+ excitation. Models show it is unlikely that the mean temperature of the gas could be above 100K. We also show that there is a possibility to produce hot H3+ in C-shocks.

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