The high velocity CO outflow in Orion

Details The high velocity CO outflow in Orion The high velocity CO outflow in Orion

Oct 1986

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167l..17w&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, Oct. 1986, p. L17-L20.

Astronomy and Astrophysics

Astrophysics

29

Carbon Monoxide, Molecular Clouds, Molecular Spectra, Orion Nebula, Doppler Effect, Infrared Spectra, Masers, Silicon Oxides

Scientific paper

Maps of the CO outflow in Orion KL with resolutions of 21 arcsec (at 115.271 GHz) in the J = 1-0 line, and of 14 arcsec (at 230.538 GHz) in the J = 2-1 line are presented. For CO outflow speeds larger than 20 km/s, the angular sizes of the emission regions are constant, with a FWHP of about 24 arcsec. The noted distribution of red-shifted CO deviates from circular shape, and examination of size, position, and velocity does not suggest a constant velocity flow. Using the Case 1 model of Cabrit and Bertout (1986), data indicate that the outflow axis is within 30 deg of the line-of-sight, that the flow is accelerated, and that the flow age is 20,000 years. Results may give support for a clumped outflow, though the indication that the 2-1 and 1-0 lines are optically thin in the high velocity ranges indicates that such clumps may only be a small part of the outflowing gas.

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