The APEX-CHAMP+ view of the orion molecular cloud 1 core

Abstract

A high density portion of the OrionMolecular Cloud 1 (OMC-1) contains the prominent, warm Kleinmann-Low (KL) nebula plus a farther region in which intermediate to high mass stars are forming. Its nearness makes the OMC-1 core region a touchstone for research on the dense molecular interstellar medium. Using the 2×7 pixel submillimeter CHAMP+array on the Atacama Pathfinder Experiment telescope (APEX), we have imaged the line emission from the multiple transitions of several carbon monoxide (CO) isotopologues over the OMC-1 core region. The large-scale images of12CO,13CO, and C18O from mid-J transitions (J D 6 - 5 to 8 - 7) have been presented recently. Here we report the shell-like structure seen in12CO lines toward Orion BN/KL, which is likely associated with the expanding bubble suggested before.