Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987a%26a...176..299c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 176, no. 2, April 1987, p. 299-316.
Astronomy and Astrophysics
Astrophysics
122
Abundance, Carbon Monoxide, Interstellar Matter, Molecular Clouds, Astronomical Maps, Brightness Distribution, Formyl Ions, Gas Density, Radio Emission
Scientific paper
The authors have mapped, with a 5arcmin angular resolution, the emission from the J = 1→0 lines of 12C16O, 13C16O, 12C18O, H12C16O+, and H13C16O+ over Heiles Cloud 2, the dark cloud which contains the source TMC1. They have also surveyed with a higher resolution the darkest parts of this cloud in the J = 2→1 and J = 1→0 lines of the three CO isotopes. The data suggests that HCL 2 consists of two bending filaments of mass ≈100 M_sun;, surrounded by an envelope of comparable mass. The filaments are most clearly visible in C18O and 13CO and enclose dense clumps detected in H13CO+. The H12CO+ emission is observed throughout the filaments; it probably results from scattering of the clump radiation by the filament outer parts. The distance to HCL 2 has been re-determined, and found to be equal to 100 pc.
Cernicharo Jose
Guélin Michel
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