Phillips, J. P. and White, G. J.
CO observations of the dark clouds Heiles 2, L1333, L1778 and L129.
Monthly Notices of the Royal Astronomical Society, 194
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12C16O and 13C16O J = 1→0 lines of the dark clouds Heiles 2(TMC-1), L1333, L1778, and L129 are presented. A velocity discontinuity in H I maps of Heiles 2 is reflected in a corresponding CO temperature change, and interpreted as a Mach ~3 shock propagating through a single molecular cloud. It is suggested that TMC-1 has recently emerged from the shock, and that evolutionary factors account for the apparently anomalous occurrence of cyanopolynes in this source. L1333 has two distinct velocity components at -2.3 and +3.6 km s-2 extending over ~0.1 square degrees. Both clouds are rotating, although the orientations of the rotational axes differ significantly. The observations are interpreted in terms of dynamically interacting molecular clouds, a single contracting cloud, and in terms of a cloud through which a high Mach number (M~35) shock is propagating.
In contrast, L1778 and L129 exhibit simple spatial structures showing a central core surrounded by a more diffuse envelope. No evidence for rotation or multiple velocity components is evident. Visual extinction maps made with similar spatial resolution to the molectular data show a general correspondence of the molecules and dust.
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