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Small Scale Structure in Nearby Molecular Gas

Published online by Cambridge University Press:  12 April 2016

Edith Falgarone
Edith Falgarone*
Affiliation:
Laboratoire de Radioastronomie, Ecole Normale Supérieure, 24 rue Lhomond, F-75231 Paris Cedex 05, France

Abstract

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Recent observations at high angular resolution of molecular clouds of low column density have revealed the presence of a conspicuous net of small scale filamentary structures, visible in the 12CO rotational lines only. In addition, the existence of unresolved structure at scales as small as ~ 200 AU in space and/or velocity space is inferred from the spectral properties of the 12CO and 13CO emission. The resolved structures are part of the hierarchy of structures observed in molecular gas in the Solar Neighborhood and appear as non self-gravitating elements confined by an ambient pressure P0/kB ~ 3 × 104cm−3 K. We show why these structures might have their origin in the intermittent structures of turbulence in which viscous dissipation is concentrated in space and time.

Type
Part V Magnetic Fields, Molecular Clouds, and Interstellar Bubbles
Information
International Astronomical Union Colloquium , Volume 166: The Local Bubble and Beyond , 1997 , pp. 251 - 260
Copyright
Copyright © Springer-Verlag 1998

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