Volume 602, June 2017
|Number of page(s)||5|
|Published online||31 May 2017|
Gravitational collapse of the OMC-1 region⋆
1 Institute for Astrophysics, University of Vienna, Türkenschanzstrasse 17, 1180 Vienna, Austria
2 Leiden Observatory, Leiden University, PO Box 9513, 2300 RA Leiden, The Netherlands
3 Observatorio Astronomico Nacional (IGN), C/ Alfonso XII, 3, 28014 Madrid, Spain
4 Instituto de Ciencias de Materiales de Madrid (CSIC), C/ Sor Juana Ines de la Cruz 3, 28049 Cantoblanco, Madrid, Spain
Received: 5 March 2017
Accepted: 9 March 2017
We have investigated the global dynamical state of the integral shaped filament in the Orion A cloud using new N2H+ (1−0) large-scale, IRAM 30 m observations. Our analysis of its internal gas dynamics reveals the presence of accelerated motions towards the Orion Nebula Cluster, showing a characteristic blue-shifted profile centred at the position of the OMC-1 South region. The properties of these observed gas motions (profile, extension, and magnitude) are consistent with the expected accelerations for the gravitational collapse of the OMC-1 region and explain both the physical and kinematic structure of this cloud.
Key words: ISM: clouds / ISM: kinematics and dynamics / ISM: structure / stars: formation / submillimeter: ISM
© ESO, 2017
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