Large Scale Structure and Kinematics of the Orion Ridge

Details Large Scale Structure and Kinematics of the Orion Ridge Large Scale Structure and Kinematics of the Orion Ridge

Jan 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993aas...18111602w&link_type=abstract

American Astronomical Society, 181st AAS Meeting, #116.02; Bulletin of the American Astronomical Society, Vol. 25, p.733

Astronomy and Astrophysics

Astronomy

Scientific paper

Clumps and filamentary structures have previously been observed in the extended molecular ridge of OMC-1. To clarify the structure and kinematics of the region, we have used the VLA to observe with high (0.3 km s(-1) ) velocity resolution and high (9'') angular resolution the NH_3 (1,1) and (2,2) rotation-inversion lines over 10 adjacent fields covering a 3' by 5' region encompassing the Kleinman-Low (KL) nebula. We present a linear mosaic of these fields, which show an abundance of structural, kinematical, and temperature information. We find evidence of extended clumpy filaments. The fragments display velocity gradients in varying directions; some may be sites of young stars or collapsing cores which have not yet shed their angular momentum. We also find material with velocities differing by more than 2 km s(-1) present within small projected areas, complicating simple global rotation models for OMC-1. We also present a temperature map of the ridge. There is evidence for large scale (0.5 pc) outflows originating from the KL core and extending along the filaments, with possible interaction. We discuss the likelihood of instability and fragmentation along the filaments.

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