Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-10-02
Astron.Astrophys.412:417-430,2003
Astronomy and Astrophysics
Astrophysics
19 pages, 21 PostScript figures. Accepted for publication in Astronomy & Astrophysics. Uses aa LaTeX macros
Scientific paper
10.1051/0004-6361:20031474
We report on a novel kind of small scale structure in molecular clouds found in IRAM-30m and CSO maps of 12CO and 13CO lines around low mass starless dense cores. These structures come to light as the locus of the extrema of velocity shears in the maps, computed as the increments at small scale (about 0.02 pc) of the line velocity centroids. These extrema populate the non-Gaussian wings of the shear probability distribution function (shear-PDF) built for each map. They form elongated structures of variable thickness, ranging from less than 0.02 pc for those unresolved, up to 0.08 pc. They are essentially pure velocity structures. We propose that these small scale structures of velocity shear extrema trace the locations of enhanced dissipation in interstellar turbulence. In this picture, we find that a significant fraction of the turbulent energy present in the field would be dissipating in structures filling less than a few % of the cloud volume.
Falgarone Edith
Pety Jérôme
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