Small-scale dissipative structures of the diffuse ISM: CO diagnostics

Details Small-scale dissipative structures of the diffuse ISM: CO diagnostics Small-scale dissipative structures of the diffuse ISM: CO diagnostics

Jun 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006sf2a.conf..239h&link_type=abstract

SF2A-2006: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics Eds.: D. Barret, F. Casoli, G.

Astronomy and Astrophysics

Astrophysics

Scientific paper

Observations of translucent molecular gas in the emission of CO and 13CO lines, with high spectral and spatial resolutions, evidence structures at small scales. The sensitivity of our observations allows to map the optically thin 12CO and reveals that it is not uniformly distributed but forms warm filaments with high aspect ratio. The 12CO and 13CO(1-0) emissions consist of elongated structures whose orientations are parallel to the plane of the sky projection of the magnetic fields. From the statistical analysis of the velocity field, the 12CO-thin filaments are found to coincide with the regions of largest velocity shear. Combining our data to large-scale observations with poorer spatial resolution, we show that these regions remain coherent over more than a parsec. These warm filaments are proposed to be the sites of the intermittent dissipation of turbulence.

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