A map of OMC-1 in CO J = 9→8

Daniel P Marrone, James Battat, Frank Bensch, Raymond Blundell, Marcos Diaz, Hugh Gibson, Todd Hunter, Denis Meledin, Scott Paine, D. Cosmo Papa, Simon Radford, Michael Smith, Edward Tong

Research output: Contribution to journalArticle

20 Citations (Scopus)

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 θ1 C 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.

Original languageEnglish (US)
Pages (from-to)940-945
Number of pages6
JournalAstrophysical Journal
Volume612
Issue number2 I
DOIs
StatePublished - Sep 10 2004
Externally publishedYes

Fingerprint

Chile
velocity structure
antenna
observatories
astrophysics
outflow
antennas
observatory
receivers
temperature
telescopes
gradients
photons
gases
gas
modeling
distribution

Keywords

  • ISM: clouds
  • ISM: individual (OMC-1, Orion Bar, Orion Kleinmann-Low)
  • ISM: molecules
  • Radio lines: ISM
  • Submilliineter

ASJC Scopus subject areas

  • Space and Planetary Science

Cite this

Marrone, D. P., Battat, J., Bensch, F., Blundell, R., Diaz, M., Gibson, H., ... Tong, E. (2004). A map of OMC-1 in CO J = 9→8. Astrophysical Journal, 612(2 I), 940-945. https://doi.org/10.1086/422831

A map of OMC-1 in CO J = 9→8. / Marrone, Daniel P; Battat, James; Bensch, Frank; Blundell, Raymond; Diaz, Marcos; Gibson, Hugh; Hunter, Todd; Meledin, Denis; Paine, Scott; Cosmo Papa, D.; Radford, Simon; Smith, Michael; Tong, Edward.

In: Astrophysical Journal, Vol. 612, No. 2 I, 10.09.2004, p. 940-945.

Research output: Contribution to journalArticle

Marrone, DP, Battat, J, Bensch, F, Blundell, R, Diaz, M, Gibson, H, Hunter, T, Meledin, D, Paine, S, Cosmo Papa, D, Radford, S, Smith, M & Tong, E 2004, 'A map of OMC-1 in CO J = 9→8', Astrophysical Journal, vol. 612, no. 2 I, pp. 940-945. https://doi.org/10.1086/422831
Marrone DP, Battat J, Bensch F, Blundell R, Diaz M, Gibson H et al. A map of OMC-1 in CO J = 9→8. Astrophysical Journal. 2004 Sep 10;612(2 I):940-945. https://doi.org/10.1086/422831
Marrone, Daniel P ; Battat, James ; Bensch, Frank ; Blundell, Raymond ; Diaz, Marcos ; Gibson, Hugh ; Hunter, Todd ; Meledin, Denis ; Paine, Scott ; Cosmo Papa, D. ; Radford, Simon ; Smith, Michael ; Tong, Edward. / A map of OMC-1 in CO J = 9→8. In: Astrophysical Journal. 2004 ; Vol. 612, No. 2 I. pp. 940-945.
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