Millimeter-wavelength aperture synthesis of molecular lines toward Orion KL

Details Millimeter-wavelength aperture synthesis of molecular lines toward Orion KL Millimeter-wavelength aperture synthesis of molecular lines toward Orion KL

Apr 1981

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1981apj...245l..87w&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor, vol. 245, Apr. 15, 1981, p. L87-L90.

Astronomy and Astrophysics

Astrophysics

28

Interstellar Gas, Line Spectra, Molecular Spectra, Orion Nebula, Emission Spectra, Interferometry, Millimeter Waves, Rotating Fluids, Silicon Oxides, Sulfur Oxides

Scientific paper

The Hat Creek interferometer was used to do the first spectral-line aperture synthesis mapping of Orion KL at a wavelength of 3.4 mm. Maps with resolutions of 15 x 24 arcsec were made for transitions of SO, SiO, HCN, and HCO(+). The 9 km/s 'spike' components in the spectra of these molecules were largely resolved out by the interferometer, so that the maps delineate primarily the region of wide-velocity 'pedestal' emission. The HCO(+) pedestal emission appears to originate from a region greater than 50 arcsec in size. The SO pedestal emission is centered on the core of KL, near IRc4; its deconvolved size is 13 x 15 arcsec. The BN object is offset from the center of the SO pedestal emission and so is unlikely to be the source of energy for the high-velocity gas. It is suggested that infrared radiation trapped by the 9-micron silicate dust absorption feature may be an important source of excitation for SO and SiO.

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