Variation in the velocity dispersion of rotationally excited H2

Details Variation in the velocity dispersion of rotationally excited H2 Variation in the velocity dispersion of rotationally excited H2

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aspc..348..445l&link_type=abstract

Astrophysics in the Far Ultraviolet: Five Years of Discovery with FUSE ASP Conference Series, Vol. 348, Proceedings of the Confe

Astronomy and Astrophysics

Astrophysics

1

Scientific paper

We present a study of the velocity dispersion of the high rotational levels (J ≥ 2) of H2. The spectrum fitting parameter b increases with the level of excitation, as previously seen by the Copernicus (Spitzer & Cochran 1973) and IMAPS (Jenkins & Peimbert 1997) observatories. In particular, we show with 4σ confidence that for HD 192639 it is not possible to fit all J levels with a single b value. We propose a mechanism in which the broadening is due to those molecules that are rotationally excited through the excess energy acquired after their formation on a grain (H2-formation pumping). We show that in a medium with a density of a few 10 cm-3, a broadening of the order of 8 km s-1 is to be expected for the J = 5 level.

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