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Title:
A Map of OMC-1 in CO J=9-8 (1.037 THz)
Authors:
Marrone, D. P.; Battat, J.; Bensch, F.; Blundell, R.; Hunter, T.; Loudkov, D.; Paine, S.; Tong, C.-Y. E.; Meledin, D.; Gibson, H.; Radford, S.; Diaz, M.
Affiliation:
AA(CfA), AB(CfA), AC(CfA), AD(CfA), AE(CfA), AF(CfA), AG(CfA), AH(CfA), AI(Chalmers University of Technology), AJ(RPG Radiometer Physics GmbH), AK(NRAO), AL(Boston University)
Publication:
American Astronomical Society Meeting 203, #111.12; Bulletin of the American Astronomical Society, Vol. 35, p.1383
Publication Date:
12/2003
Origin:
AAS
Bibliographic Code:
2003AAS...20311112M

Abstract

The distribution of 12C16O J=9-8 (1.037 THz) emission has been mapped in OMC-1 at 35 points with 84'' resolution. This is the first map of this source in this transition and only the second velocity-resolved ground-based observation of a line in the terahertz frequency band. There is emission present at all points in the map, a region roughly 4' by 6' in size, with peak antenna temperature dropping only near the edges. Away from the Orion KL outflow, most of the emission comes from the OMC-1 photon-dominated region with a typical linewidth of 4-6 km s-1. Large velocity gradient modeling of the emission in J=9-8 and six lower transitions suggests that the lines originate in regions with temperatures around 120 K and densities around 104 cm-3 near Θ 1C Ori and at the Orion Bar, and from 70-80 K gas at slightly lower density southeast and west of the bar.

These observations were made with the 0.8 m Smithsonian Astrophysical Observatory Receiver Lab Telescope, located at an extremely high (5525 m) and dry site in Northern Chile. At this site atmospheric windows above 1 THz allow observations of several rotational transitions of CO, along with the ground state transition of N+ and many other common and exotic atomic and molecular lines previously unobserved from the ground.

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