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Shocked H2 and Fe+ Dynamics in the Orion Bullets

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posted on 03.08.2016, 12:04 by Jonathan A. Tedds, Peter W. J. L. Brand, Michael G. Burton
Observations of H2 velocity profiles in the two most clearly defined Orion bullets are extremely difficult to reconcile with existing steady-state shock models. We have observed [FeII] 1.644um velocity profiles of selected bullets and H2 1-0 S(1) 2.122um velocity profiles for a series of positions along and across the corresponding bow-shaped shock fronts driven into the surrounding molecular cloud. Integrated [FeII] velocity profiles of the brightest bullets are consistent with theoretical bow shock predictions. However, observations of broad, singly-peaked H2 1-0 S(1) profiles at a range of positions within the most clearly resolved bullet wakes are not consistent with molecular shock modelling. A uniform, collisionally broadened background component which pervades the region in both tracers is inconsistent with fluorescence due to the ionizing radiation of the Trapezium stars alone.

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Citation

Monthly Notices of the Royal Astronomical Society, 307 (2), pp. 337-356

Author affiliation

/Organisation/COLLEGE OF MEDICINE, BIOLOGICAL SCIENCES AND PSYCHOLOGY/School of Medicine/Department of Health Sciences

Version

VoR (Version of Record)

Published in

Monthly Notices of the Royal Astronomical Society

Publisher

Oxford University Press (OUP) for The Royal Astronomical Society

issn

0035-8711

eissn

1365-2966

Copyright date

1999

Available date

03/08/2016

Publisher version

http://mnras.oxfordjournals.org/content/307/2/337

Language

en

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