Follow-up observations of Planck cold clumps in   $^{12}$CO/$^{13}$CO/C$^{18}$O (1--0) transitions
  The Planck Early Cold Cores Catalog (ECC) provides an unbiased list of Galactic cold clumps, which form an ideal sample for studying the early phases of star formation (\cite[Planck Collabrators et al. 2011]{Planck_etal11}). To study their properties, we have carried out a molecular line ($^{12}$CO/$^{13}$CO/C$^{18}$O) survey towards 674 Planck cold clumps in the ECC with the PMO 13.7 m telescope. 
Yuefang Wu, Tie Liu, Fanyi Meng
astro-ph.SR astro-ph.GA