Other
Scientific paper
Nov 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006rspta.364.3035g&link_type=abstract
Royal Society of London Transactions Series A, vol. 364, Issue 1848, p.3035-3042
Other
5
Infrared Spectroscopy, Interstellar Clouds, Interstellar Molecules
Scientific paper
High-resolution spectroscopy of bright infrared sources in the centre of the Galaxy has resulted in the detection of H3+ in a remarkable array of dense and diffuse clouds along the 8000parsec long line of sight, at a wide range of distances from the centre. Most prominent among these is a previously undetected, but very large amount of warm (T˜250K) and diffuse (n˜100cm2) gas within a few hundred parsecs of the centre. The key to understanding the environment of the H3+ in this region is an H3+ absorption line at 3.53μm from the metastable (3,3) rotational level, which has not been detected in dense or diffuse clouds outside of the Galactic centre (GC). We have used spectroscopy of this line along with other lines of H3+ and CO to characterize all of the clouds along the line of sight to the GC. The high abundance of H3+ in the central few hundred parsecs implies an ionization rate there that is several times larger than estimated for diffuse clouds outside the GC, and nearly two orders of magnitude greater than originally predicted for diffuse clouds.
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