Physical properties, kinetics and mass function of 12 northern infrared dark clouds

Xiao-Lan Liu, Jun-Jie Wang, Jin-Long Xu

The physical, chemical and kinetic characteristics of 12 northern infrared dark clouds (IRDCs) are systematic studied using the ${}^{13}\mathrm{CO}$ (1-0) and ${\mathrm{C}}^{18}\mathrm{O}$ (1-0) lines,…