Abstract:
We present a study of the molecular cloud in Sh2-112 massive star forming region using the 3-2
transition of CO isotopologues: CO, 13CO and C18O; supplemented in part by CGPS Hi line emission and
MSX data. Sh2-112 is an optically visible region powered by an O8V type massive star BD+45 3216, and hosts
two Red MSX Survey sources: G083.7962+03.3058 and G083.7071+03.2817, classified as Hii region and
young stellar object, respectively. Reduced spectral data products from the James Clerk Maxwell Telescope
archive, centered on the two RMS objects with ∼7 × 7 field-of-view each, were utilized for the purpose.
The 13CO(3-2) channel map of the region shows the molecular cloud to have filamentary extensions directed
away from the massive star, which also seems to be at the edge of a cavity like structure. Multiple molecular
cloud protrusions into this cavity structure, host local peaks of emission. The integrated emission map of the
region constructed from only those emission clumps, detected above 5σ level in the position–position–velocity
space affirms the same. MSX sources were found distributed along the cavity boundary, where the gas has been
compressed. Spectral extraction at these positions yielded high Mach numbers and low ratios of thermal to
non-thermal pressures, suggesting a dominance of supersonic and non-thermal motion in the cloud.
