High-velocity gas in the Orion BN/KL region - Observations of the carbon monoxide /2-1/ and sulfur dioxide /13/1,13/-12/0,12/ lines

Details High-velocity gas in the Orion BN/KL region - Observations of the carbon monoxide /2-1/ and sulfur dioxide /13/1,13/-12/0,12/ lines High-velocity gas in the Orion BN/KL region - Observations of the carbon monoxide /2-1/ and sulfur dioxide /13/1,13/-12/0,12/ lines

Nov 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...250..175k&link_type=abstract

Astrophysical Journal, Part 1, vol. 250, Nov. 1, 1981, p. 175-185. Research supported by New York University

Astronomy and Astrophysics

Astrophysics

38

Carbon Monoxide, Interstellar Gas, Line Spectra, Molecular Clouds, Orion Nebula, Sulfur Dioxides, Angular Resolution, Astronomical Maps, Emission Spectra, Molecular Spectra, Spatial Resolution, Spectrum Analysis

Scientific paper

The high-velocity gas in the region of the BN/KL cluster in Orion has been observed at high spatial resolution (25") in the 230 GHz CO and 251 GHz SO2 lines. Carbon monoxide emission is detected to about 100 km s-1. The source radius is ∼25", close to that of the inner edge of the H2 line emission region. The SO2 emission region is smaller in both velocity and angular extent than is the CO emission. The evidence suggests a roughly spherical outflow with velocity V ∝ r and a rapid density fall off: our observations give n ≍ r-3 - -4. The CO(2- 1) line is optically thin at high velocities. The 12C/13C isotope ratio is found to be 75 ± 20.
The mass of high-velocity gas is 5 Msun and the energy 2.5 × 1046 ergs. These values suggest that the source of outflowing gas is the wind of a massive O star. The outflow is characterized by velocities 100 km s-1and mass loss rates ∼10-3 -10-2 Msun yr-1, similar to those found in η Carinae.

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