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Small-scale dissipative structures of diffuse ISM turbulence: I- CO diagnostics

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arxiv astro-ph/0701326 v1 pith:S5ZD45CS submitted 2007-01-11 astro-ph

Small-scale dissipative structures of diffuse ISM turbulence: I- CO diagnostics

classification astro-ph
keywords emissionstructureshighlargestobservationsopticallyregionsshear
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Observations of translucent molecular gas in $^{12}$CO and $^{13}$CO emission lines, at high spectral and spatial resolutions, evidence different kinds of structures at small scales: (1) optically thin $^{12}$CO emission, (2) optically thick $^{12}$CO emission, visible in $^{13}$CO(1-0), and (3) regions of largest velocity shear in the field, found from a statistical analysis. They are all elongated with high aspect ratio, preferentially aligned with the plane-of-the-sky projection of the magnetic fields. The latter structures coincide with the former, shown to trace gas warmer and more diluted than average. Combining our data to large-scale observations of poorer spatial resolution, we show that the regions of largest velocity shear remain coherent over more than a parsec. These filaments are proposed to be the sites of the intermittent dissipation of turbulence.

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Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score.

  1. Emergence of high-mass stars in complex fiber networks (EMERGE) VI. Turbulence dissipation and the formation of dense fibers

    astro-ph.GA 2026-07 accept novelty 6.0

    In Orion, turbulence dissipates in high-shear regions near dense fibers, so the transition to coherence occurs at the fiber level before cores form.