Astronomy and Astrophysics, volume 466, 949-968 (2007/5-2)
Observations of spatial and velocity structure in the Orion molecular cloud.
NISSEN H.D., GUSTAFSSON M., LEMAIRE J.L., CLENET Y., ROUAN D. and FIELD D.
Abstract (from CDS):
Observations are reported of H2 IR emission in the S(1) v=1-0 line at 2.121 µm 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 1km/s. 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 -18km/s. 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 (<5km/s) in Peak 1. (iii) A small proportion of the flows may represent sites of low mass star formation and one region shows evidence of multiple flows which may indicate multiple low mass star formation within OMC1.
ISM: jets and outflows - ISM: structure - stars: formation - stars: circumstellar matter - ISM: kinematics and dynamics ISM: molecules -
VizieR on-line data:
<Available at CDS (J/A+A/466/949): tablea1.dat tablea2.dat tablea3.dat>
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