Abstract
Measurements of 6 cm H/sub 2/CO emission associated with the Orion Molecular Cloud (OMC-1) show that the peak of the emission feature at 7.4 km s/sup -1/ is centered close to the infrared source IRc5, in the southern part of the KL nebula. The peak main-beam brightness is 9 K, and the emission region hass a deconcolved size of 25'' x 11'' (0.06 x 0.03 pc). The low peak brightness temperature implies that the H/sub 2/CO excitation is thermal. Absorption by H/sub 2/CO is seen toward the southern peak found at 400 ..mu..m. This source is probably behind the optical H II region; it has a deconvolved size of < or =30''. The weaker absorption and emission features are consisent with sizes greater than 15'', showing clumpiness in the H/sub 2/CO emission and absorption.
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