2013ApJS..209...37M

A mapping study of 71 Planck cold clumps was made with ¹²CO(1-0), ¹³CO(1-0), and C¹⁸O(1-0) lines at the 13.7 m telescope of Purple Mountain Observatory. For all the clumps, ¹²CO(1-0) and ¹³CO(1-0) emissions were detected, while for 55 of them, C¹⁸O(1-0) emissions were detected. Of the 71 Clumps, 34 are in the Taurus Complex, 24 in the California Complex, and 13 are in the Perseus Complex. In the 76 velocity components, 38 cores are found in 27 clumps; 19 of these cores are in the Taurus Complex, 16 in the California Complex, and 3 in the Perseus Complex. We acquired V_lsr, T_A and FWHM of lines. Physical parameters including T_ex, N_H2, σ_Therm, σ_NT, and σ_3Dwere calculated. Generally, the cores are of T_ex= 2-16 K, N_H2/cm2, and σ_3D= 0.2-1.0 km/s. In the Taurus Complex, the cores are less dense on average and have smaller σ_Thermthan the cores in the Perseus and California Complexes. Two of the three cores in the Perseus Complex are revealed to have larger T_ex, N_H2, and σ_3D than the mean values in the other two regions. Most of the cores have σ_NTlarger than σ_Therm, suggesting a dominance of turbulence in our cores. The majority of the cores have M_vir/M_LTE{Gt} 1, which indicates these cores are not bound and will disperse. By comparing our results with the dust properties revealed by the Planck Early Release Cold Cores Catalog, we investigated the coupling of gas and dust components. We found that most of the cores have dust temperatures higher than their gas temperatures. The stellar objects associated with our sources were checked and 90% of the cores were found to be starless.