(CO)-C-12 AND (CO)-C-13 OBSERVATIONS OF THE DARK CLOUD COMPLEX NEAR IC5146

A large scale survey of a dark cloud complex in the vicinity of IC5146 has been made in the (CO)-C-12(J = 1 - 0) and (CO)-C-13(J = 1 - 0) emission lines. 3000 spectra were obtained with 2' grid spacing for each line for an area of approximately 3-degrees X 2-degrees. Five CO clouds and fifteen (CO)-C-13 clumps are identified, and physical parameters such as mass, temperature, density of H-2 Molecules are derived for each clump. Total molecular mass of the dark cloud complex is estimated to be approximately 4500M. by assuming LTE, about 50% larger than that of the Taurus complex. The clumps are found to be nearly in virial equilibrium. There are 18 candidates for the young stellar objects in the region, and 13 of them are concentrated into two (CO)-C-13 clouds. Most active star formation is found in the most massive member of the complex having molecular mass of -2200M.. The cloud consists of two (CO)-C-13 clumps, whose masses are approximately 1 X 10(3)M., respectively, and is associated with six candidates for the young stellar objects. The velocity distribution of the entire cloud complex is characterized by a velocity gradient of 0.17 km s-1 pc-1 along the elongation of the complex over 2-degrees, in addition to a velocity gradient of approximately 0.27 km s-1 pc-1 orthogonal to the elongation at some places.