Warm and Diffuse Gas near the Galactic Center probed by Metastable H3+

Details Warm and Diffuse Gas near the Galactic Center probed by Metastable H3+ Warm and Diffuse Gas near the Galactic Center probed by Metastable H3+

May 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...206.3701g&link_type=abstract

American Astronomical Society Meeting 206, #37.01; Bulletin of the American Astronomical Society, Vol. 37, p.488

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Scientific paper

Using observations of a line from the metastable (3,3) rotational level of H3+ combined with measurements of other lines of H3+ and CO, we have discovered a large quantity of high temperature (T ˜250K) and low density (n ˜100 cm-3) gas within the central few hundred parsecs of the Galaxy. Some of this gas has velocities near -100 km s-1 (LSR) and apparently is associated with the Expanding Molecular Ring at a distance of 180 pc from the nucleus; most of the remainder is at velocities near -50, 0, and + 50 km s-1. Previous interpretations of the interstellar gas in the central few hundred parsecs have been that it is mostly in the form of dense clouds which have a filling factor of ˜0.1. The observations reported here suggest that the filling factor of dense gas is much smaller than this. The metastable H3+ level is not populated in a number of star-forming clouds far from the Galactic Center.

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