Astronomy and Astrophysics – Astrophysics
Scientific paper
Jun 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...293..508f&link_type=abstract
Astrophysical Journal, Vol.293, NO. 2/JUN15, P. 508, 1985
Astronomy and Astrophysics
Astrophysics
118
Scientific paper
We report on an investigation of high-velocity molecular material near the vibrationally excited H2 emission regions in the objects DR 21, W75 N, NGC 7538, OMC-2, NGC 6334/Peak V, and the Herbig-Haro Object 2. The 12CO(J = 1-0) and 13CO(J = 1-0) transitions were used as tracers of the high-velocity molecular flows. All the H2 sources are associated with bipolar CO high-velocity flows. We also present a new highspatial-resolution map (11") of the DR 21 H2 region. The spatial relationship of the high-velocity gas and the vibrationally excited gas, together with the similarity of the energies involved in the two molecular components, is convincing evidence to support the scenario in which the H2 emission traces the cooling gas that has been shocked by outflowing gas. Although radiation pressure could be responsible for driving the flows in OMC-2 and NGC 7538, it is unlikely to be the driving mechanism in DR 21 and W75 N. Similarly, H II region expansion does not appear to be the driving mechanism for any of the outflows.
Fischer Jan
Sanders David B.
Simon Manfred
Solomon Philip M.
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