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Probing turbulence in OMC1 at the star forming scale: observations and simulations†

Published online by Cambridge University Press:  01 August 2006

Maiken Gustafsson ,
Axel Brandenburg ,
Jean-Louis Lemaire  and
David Field
Maiken Gustafsson
Affiliation:
Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark email: maikeng@phys.au.dk, dfield@phys.au.dk
Axel Brandenburg
Affiliation:
NORDITA, Blegdamsvej 17, 2100 Copenhagen θ, Denmark
Jean-Louis Lemaire
Affiliation:
Observatoire de Paris & Université de Cergy-Pontoise, LERMA & UMR 8112 du CNRS, 92195 Meudon, France
David Field
Affiliation:
Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark email: maikeng@phys.au.dk, dfield@phys.au.dk
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Abstract

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Using radial velocities of vibrationally excited H2 emission in OMC1 we present the structure functions and the scaling of the structure functions with their order at scales ranging from 70 AU to 30000 AU extending earlier related studies to scales lower by two orders of magnitude. The structure functions for OMC1 show clear deviations from power laws at 1500 AU. The scaling of the higher order structure functions with order deviates from predicted theoretical scalings. Observational results are compared with simulations of supersonic hydrodynamic turbulence. The unusual scaling is explained as a selection effect of preferentially observing the shocked part of the gas. The simulations are unable to reproduce the deviations from power laws of the structure functions.

Keywords

turbulenceshock wavesISM: kinematics and dynamicsISM: moleculesISM: jets and outflows
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 2 , Symposium S237: Triggered Star Formation in a Turbulent ISM , August 2006 , pp. 183 - 187
Copyright
Copyright © International Astronomical Union 2007

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