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Blitz, L., and P. Thaddeus, 1980: Giant molecular complexes and OB associations. I. The Rosette molecular complex. Astrophys. J., 241, 676-696, doi:10.1086/158379.
This is the first of three articles which present systematic observations of the molecular complexes related to OB associations in the third galactic quadrant. In this article, we present CO observations of the Rosette molecular complex which is associated with Mon OB2. The complex is extended along the galactic plane, has a maximum extent of ~100 pc, and shows a striking interaction with the Rosette Nebula. The complex appear to have a well defined boundary, and it is likely that the complex is no more than ~20% larger in any one dimension than the extent defined by our lowest contour. The molecular gas appears to be embedded in an H I cloud with a mass comparable to the molecular mass. We estimate the molecular mass to be 1.3×105 M☉, and the inferred volume density to be ~30 cm-3. The complex possesses an overall velocity gradient of 0.20 km/s*pc. At high resolution the CO appears to be very clumpy. Evidence for very recent star formation appears at the site of unusual CO self-reversal, but not at the position of maximum CO emission.
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