Dense Cores in Dark Clouds. XI. A Survey for N_2H^+, C_3H_2, and CCS

Details Dense Cores in Dark Clouds. XI. A Survey for N_2H^+, C_3H_2, and CCS Dense Cores in Dark Clouds. XI. A Survey for N_2H^+, C_3H_2, and CCS

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998apj...506..743b&link_type=abstract

The Astrophysical Journal, Volume 506, Issue 2, pp. 743-757.

Astronomy and Astrophysics

Astronomy

76

Ism: Clouds, Ism: Molecules, Line: Profiles, Radio Lines: Ism

Scientific paper

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 <= 0.03 km s^-1, which is the first observational constraint on the relative speed of ions and neutrals in star-forming dense cores. Twenty of the cores were also observed in the J_N = 4_3-3_2 line of CCS. From our N_2H^+ observations, the fractional abundance of the molecular nitrogen N_2 is found to be ~=7 x 10^-5, consistent with all the nitrogen being in molecular form and not depleted onto dust grains.

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