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Title:
A Map of OMC-1 in CO J = 9-->8
Authors:
Marrone, Daniel P.; Battat, James; Bensch, Frank; Blundell, Raymond; Diaz, Marcos; Gibson, Hugh; Hunter, Todd; Meledin, Denis; Paine, Scott; Papa, D. Cosmo; Radford, Simon; Smith, Michael; Tong, Edward
Affiliation:
AA(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .), AB(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .), AC(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .; Current address: Radioastronomisches Institut der Universität Bonn, Auf dem Hügel 71, D-53121 Bonn, Germany; .), AD(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .), AE(Boston University, Department of Electrical and Computer Engineering, 8 St. Mary's Street, Boston, MA 02215; .), AF(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .; Current address: RPG Radiometer Physics GmbH, Birkenmaarstrasse 10, 53340 Meckenheim, Germany; .), AG(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .), AH(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .; Current address: GARD/MC2, Fysikgrand 3, Chalmers University of Technology, S-412 96 Gothenburg, Sweden; .), AI(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .), AJ(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .), AK(National Radio Astronomy Observatory, 949 North Cherry Avenue, Tucson, AZ 85721; .), AL(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .), AM(Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138; (corresponding author), , , , , , , .)
Publication:
The Astrophysical Journal, Volume 612, Issue 2, pp. 940-945. (ApJ Homepage)
Publication Date:
09/2004
Origin:
UCP
ApJ Keywords:
ISM: Clouds, ISM: Individual: Alphanumeric: OMC-1, ISM: Individual: Name: Orion Bar, ISM: Individual: Name: Orion Kleinmann-Low, ISM: Molecules, Radio Lines: ISM, Submillimeter
DOI:
10.1086/422831
Bibliographic Code:
2004ApJ...612..940M

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 THz frequency band. There is emission present at all points in the map, a region roughly 4'×6' in size, with peak antenna temperature dropping only near the edges. Away from the Orion KL outflow, the velocity structure suggests that most of the emission comes from the OMC-1 photon-dominated region, with a typical line width of 3-6 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 of at least 103.5 cm-3 near θ1C Ori and at the Orion bar, and from 70 K gas at around 104 cm-3 southeast and west of the bar. These observations are among the first made with the 0.8 m Smithsonian Astrophysical Observatory Receiver Lab Telescope, a new instrument designed to observe at frequencies above 1 THz from an extremely high and dry site in northern Chile.
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