Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...167..333t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 167, Oct. 1986, p. 333-340. Research supported by the Alexander von Humboldt S
Astronomy and Astrophysics
Astronomy
23
Ammonia, Interstellar Matter, Molecular Clouds, Molecular Spectra, Star Formation, Angular Resolution, Astronomical Models, High Resolution, Infrared Sources (Astronomy), Reflection Nebulae
Scientific paper
The bipolar flow source near NGC 2071 in the NH3 (J, K) = (1,1) and (2,2) lines with about 40 arcsec angular resolution is observed using the Effelsberg 100m telescope. The column density distribution of the NH3 molecule shows an elongated structure of about 0.4 pc x 0.15 pc orthogonal to the high velocity CO bipolar flow with a small velocity gradient of about 1.4 km/s per pc along its major axis. The rotation temperature determined from intensity ratio of the (2,2) and the (1,1) lines peaks around the central infrared sources, which implies heating of the ambient cloud by those sources. An analysis of the NH3 profiles suggests that part of the NH3 emission comes from a disturbed, dense gas probably stripped off from the quiescent clumpy clouds by the outflowing material from the central infrared source(s). This may be interpreted that the elongated structure of the dense cloud is a result of the disintegration of a parental cloud by the bipolar outflow rather than that the structure collimates an isotropic outflow into the bipolar directions.
Fukui Yasuo
Stutzki Juergen
Takano Toshiaki
Winnewisser Gisbert
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