{ "id": "1203.3056", "version": "v1", "published": "2012-03-14T11:44:04.000Z", "updated": "2012-03-14T11:44:04.000Z", "title": "A 3D view of the outflow in the Orion Molecular Cloud 1 (OMC-1)", "authors": [ "H. D. Nissen", "N. J. Cunningham", "M. Gustafsson", "J. Bally", "J. -L. Lemaire", "C. Favre", "D. Field" ], "comment": "Accepted for publication in Astronomy and Astrophysics (A&A), 12 pages, 9 figures", "doi": "10.1051/0004-6361/201117495", "categories": [ "astro-ph.GA" ], "abstract": "The fast outflow emerging from a region associated with massive star formation in the Orion Molecular Cloud 1 (OMC-1), located behind the Orion Nebula, appears to have been set in motion by an explosive event. Here we study the structure and dynamics of outflows in OMC-1. We combine radial velocity and proper motion data for near-IR emission of molecular hydrogen to obtain the first 3-dimensional (3D) structure of the OMC-1 outflow. Our work illustrates a new diagnostic tool for studies of star formation that will be exploited in the near future with the advent of high spatial resolution spectro-imaging in particular with data from the Atacama Large Millimeter Array (ALMA). We use published radial and proper motion velocities obtained from the shock-excited vibrational emission in the H2 v=1-0 S(1) line at 2.122 $\\mu$m obtained with the GriF instrument on the Canada-France-Hawaii Telescope, the Apache Point Observatory, the Anglo-Australian Observatory and the Subaru Telescope. These data give the 3D velocity of ejecta yielding a 3D reconstruction of the outflows. This allows one to view the material from different vantage points in space giving considerable insight into the geometry. Our analysis indicates that the ejection occurred <720 years ago from a distorted ring-like structure of ~15\" (6000 AU) in diameter centered on the proposed point of close encounter of the stars BN, source I and maybe also source n. We propose a simple model involving curvature of shock trajectories in magnetic fields through which the origin of the explosion and the centre defined by extrapolated proper motions of BN, I and n may be brought into spatial coincidence.", "revisions": [ { "version": "v1", "updated": "2012-03-14T11:44:04.000Z" } ], "analyses": { "keywords": [ "orion molecular cloud", "3d view", "atacama large millimeter array", "star formation", "proper motion data" ], "tags": [ "journal article" ], "publication": { "journal": "Astronomy and Astrophysics", "year": 2012, "month": "Apr", "volume": 540 }, "note": { "typesetting": "TeX", "pages": 12, "language": "en", "license": "arXiv", "status": "editable", "inspire": 1093781, "adsabs": "2012A&A...540A.119N" } } }