Abstract

We present CO(J = 2 ? 1) data covering from 270° to 360° in Galactic longitude, at latitude b = 0° (IV quadrant). These data were obtained with the VST2 (Very Small Telescope 2), a 60 cm antenna with a beam of 8.9 arcmin (FWHM) installed by the University of Tokyo at ESO La Silla, Chile (Hasegawa et al. 1996). The new data are analyzed under a similar axisymmmetric model from Sakamoto et al. (1997) for b = 0°, and using published CO(J = 1 ? 0) data by Bronfman et al. (1989). The distribution of the T R*(J = 2 ? 1)/T R*(J = 1 ? 0) ratio is compared to that of massive star forming regions from the catalogs of Bronfman et al. (1996) and Caswell & Haynes (1987). © Universidad Nacional Autónoma de México.