Dense Cores in Dark Clouds. XI. A Survey for N 2 H + , C 3 H 2 , and CCS

Abstract

We have used the 3 mm receiver and upgraded antenna of Haystack Observatory to make high spatial and spectral resolution observations of lines of N_2H^+ and C_3H_2 in 60 dense cores. Both species are detected in most of the cores, and the velocities, and line widths are well correlated. This suggests that ions and neutrals are well coupled. We found v_D,max