Turbulent formation and excitation of molecules in diffuse media.

Details Turbulent formation and excitation of molecules in diffuse media. Turbulent formation and excitation of molecules in diffuse media.

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280p.231l&link_type=abstract

The Molecular Universe, Posters from the proceedings of the 280th Symposium of the International Astronomical Union held in Tole

Astronomy and Astrophysics

Astronomy

Scientific paper

We propose two new investigations of molecule formation and excitation in diffuse media via shock dissipated turbulence. We first present models of irradiated shocks. Shocks are privileged channels which overcome the endoenergetic barriers for the formation of CH_n^+ molecules. We show how the dissociative power of an incident UV field helps shifting the chemical equilibrium towards production of low n CH_n^+ molecules. In particular, this may explain the large CH^+ column-densities sometimes probed by Herschel (e.g. in DR21). The Stefan Quintett harbors a large scale shock with strong emission from S(0) to S(5) H2-lines. Its location far away from sources of stellar irradiation points at mechanical energy dissipation as the primary energy source for this emission. We present our attempt to account for the excitation diagram of H2 with a random distribution of low velocity shocks. We show how the observations constrain the statistical distribution of these shocks.

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