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Journal Articles Astronomy and Astrophysics - A&A Year : 2007

Observations of spatial and velocity structure in the Orion molecular cloud

Abstract

Observations are reported of H2 IR emission in the S(1) v=1-0 line at 2.121 mum in the Orion Molecular Cloud, OMC1, using the GriF instrument on the Canada-France-Hawaii Telescope. GriF uses a combination of adaptive optics and Fabry-Perot interferometry, yielding a spatial resolution of 0.15´´ to 0.18´´ and velocity discrimination as high as 1 km s-1. 193 bright H2 emission regions can be identified in OMC1. The general characteristics of these features are described in terms of radial velocities, brightness and spatial displacement of maxima of velocity and brightness, the latter to yield the orientation of flows in the plane of the sky. Strong spatial correlation between velocity and bright H2 emission is found and serves to identify many features as shocks. Important results are: (i) velocities of the excited gas illustrate the presence of a zone to the south of BN-IRc2 and Peak 1, and the west of Peak 2, where there is a powerful blue-shifted outflow with an average velocity of -18 km s-1. This is shown to be the NIR counterpart of an outflow previously identified in the radio, originating from either source I or source n. (ii) There is a band of weak radial velocity features (
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Dates and versions

hal-03724125 , version 1 (17-07-2022)

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H. D. Nissen, Maiken Gustafsson, Jean-Louis Lemaire, Yann Clénet, Daniel Rouan, et al.. Observations of spatial and velocity structure in the Orion molecular cloud. Astronomy and Astrophysics - A&A, 2007, 466, pp.949-968. ⟨hal-03724125⟩
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