^12^CO and ^13^CO cores & clumps in LHA 120-N 55

This CO-to-H_2_ conversion factor for N55 clumps is measured at a spatial scale of ~0.67pc, which is about two times higher than the X_CO_ value of the Orion cloud at a similar spatial scale. The core mass function of N55 clearly show a turnover below 200M_{sun}_, separating the low-mass end from the high-mass end. The low-mass end of the ^12^CO mass spectrum is fitted with a power law of index 0.5+/-0.1, while for ^13^CO it is fitted with a power law index 0.6+/-0.2.

In the high-mass end, the core mass spectrum is fitted with a power index of 2.0+/-0.3 for ^12^CO, and with 2.5+/-0.4 for ^13^CO. This power law behavior of the core mass function in N55 is consistent with many Galactic clouds.