Volume 411, Number 3, December I 2003
|Page(s)||437 - 446|
|Section||Interstellar and circumstellar matter|
|Published online||17 November 2003|
New insight into shocks and star formation in Orion: First light with GriF*
Department of Physics and Astronomy, University of Aarhus, 8000 Aarhus C, Denmark
2 Observatoire de Paris-Meudon, LESIA, 92195 Meudon Principal Cedex, France
3 Observatoire de Paris-Meudon, LERMA and UMR8112 of the CNRS, 92195 Meudon Principal Cedex, France
4 Université de Cergy-Pontoise, LERMA and UMR8112 of the CNRS, 95806 Cergy Cedex, France
5 Institut d'Astrophysique Spatiale, Université Paris XI, 91405 Orsay Cedex, France
6 Observatoire de Grenoble, Laboratoire d'Astrophysique de l'Observatoire de Grenoble, France
Corresponding author: D. Field, firstname.lastname@example.org
Accepted: 30 June 2003
A new instrument, “GriF”, has been used on the Canada-France-Hawaii Telescope to record spatially and velocity resolved images, in the H2 –0 S(1) line in the K-band, of a field in the core of the Orion Molecular Cloud, OMC1. Using the PUEO adaptive optics system combined with Fabry-Perot interferometry, diffraction limited spatial resolution of 015 and velocity discrimination of ~1 kms-1 has been achieved. These data yield graphic images of shocks in OMC1, presenting a level of detail which has not previously been attained. Observed structures suggest that a significant fraction of the regions strongly emitting in H2 do so through local, internal shocks, associated with star formation within the clumps of gas involved. Thus the core of OMC1 is revealed for the first time as a region which contains a number of developed protostars.
Key words: ISM: individual objects: OMC1 / ISM: kinematics and dynamics / ISM: molecules / shock waves / ISM: lines and bands / stars: formation
© ESO, 2003
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