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Intense velocity-shears and magnetic fields in diffuse molecular gas: from 10 pc to 5 mpc

Published online by Cambridge University Press:  21 October 2010

Edith Falgarone  and
Pierre Hily-Blant
Edith Falgarone
Affiliation:
LERMA/LRA, CNRS UMR 8112, Ecole Normale Supérieure & Observatoire de Paris, 24 rue Lhomond, 75005 Paris, France, email: edith.falgarone@ens.fr
Pierre Hily-Blant
Affiliation:
LAOG, CNRS UMR 5571, Université Joseph Fourier, BP 53, 38041 Grenoble, France email: pierre.hilyblan@obs.ujf-grenoble.fr
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Abstract

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Regions of intense velocity-shears are identified on statistical grounds in nearby diffuse molecular gas: they form conspicuous thin (~ 0.03 pc) and parsec-long structures that do not bear the signatures of shocked gas. Several straight substructures, ~ 3 mpc thick, have been detected at different position-angles within one of them. Two exhibit the largest velocity-shears ever measured far from star forming regions, up to 780 kms−1pc−1. Their position-angles are found to be also those of 10-parsec striations in the I(100μm) dust emission of the large scale environment. The B field projections, where available in these fields, are parallel both to the parsec- and to one of the milliparsec-scale shears. These findings put in relation the small-scale intermittent facet of the gas velocity field and the large scale structure of the magnetic fields.

Keywords

TurbulenceMHDISM:magnetic fieldsISM: kinematics and dynamicsISM: structureISM: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Highlights H15: Highlights of Astronomy , November 2009 , pp. 442 - 443
Copyright
Copyright © International Astronomical Union 2010

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