Dissipation of turbulence in a dense core environment: chemical signatures

Details Dissipation of turbulence in a dense core environment: chemical signatures Dissipation of turbulence in a dense core environment: chemical signatures

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007msl..confe..92f&link_type=abstract

"Molecules in Space and Laboratory, meeting held in Paris, France, May 14-18, 2007. Editors: J.L. Lemaire, F. Combes. ISBN: 9782

Astronomy and Astrophysics

Astrophysics

1

Modelling_Environments

Scientific paper

The sites of intermittent dissipation of turbulent energy have likely been discovered in the translucent environment of a low-mass dense core. They appear as a network of narrow filamentary structures found, on statistical grounds, to be the locus of the largest shears in the velocity field traced by the CO lines. Three independent properties of these structures make them the plausible sites of intermittent dissipation of turbulence: (1) gas there is warmer and more dilute than average, (2) it bears the signatures of a non-equilibrium chemistry triggered by impulsive suprathermal heating, and (3) the radiative cooling of these structures (mostly in H2 emission) is so powerful that it balances the average turbulent heating, while active in only a few percent of the whole volume. These filamentary structures do not exhibit the properties of steady-state low-velocity magneto-hydrodynamic (MHD) shocks. They may act as tiny seeds of gas condensation in diffuse molecular gas.

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