An ammonia toroid aligned perpendicular to the HH 1 and HH 2 bipolar outflow

Details An ammonia toroid aligned perpendicular to the HH 1 and HH 2 bipolar outflow An ammonia toroid aligned perpendicular to the HH 1 and HH 2 bipolar outflow

Jul 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...294l.117t&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 294, July 15, 1985, p. L117-L120.

Astronomy and Astrophysics

Astronomy

38

Ammonia, Herbig-Haro Objects, Interstellar Gas, Nebulae, Radio Sources (Astronomy), Condensation, Molecular Flow, Molecular Spectra

Scientific paper

The ammonia emission from the region containing the Herbig-Haro objects 1 and 2, which mark the presence of a bipolar outflow, was mapped. The ammonia observations delineate an elongated structure aligned perpendicular to the bipolar outflow. This ammonia condensation is centered between HH 1 and HH 2 and coincides with the recently discovered central radio continuum source. This continuum source has no optical counterpart. The ammonia spectrum at the position of the continuum source shows a remarkable splitting. Based on the orientation of the bipolar outflow, which is known to be oriented nearly perpendicular to the line of sight, and on theoretical considerations, it is concluded that the ammonia source is part of a toroid, viewed edge-on, in slow expansion driven by the wind pressure of the central source. This toroid may be the focusing mechanism for the bipolar outflow. Searches for ammonia condensations in the vicinity of other HH objects may help localize the energy sources of these systems.

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