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|Title:||A thermal plume in NGC 2024|
Peter, Barnes J.
|Keywords:||H II REGIONS,|
SM: INDIVIDUAL: NGC 2024,
ISM: JETS AND OUTFLOWS,
RADIO CONTINUUM: ISM,
RADIO LINES: ISM
|Publisher:||Blackwell Publishing for the Royal Astronomical Society|
|Citation:||Monthly Notices of the Royal Astronomical Society, 1997, Vol.290, p431-438|
|Abstract:||We present 1-arcmin resolution radio images of the Galactic H ii region NGC 2024 made at 0.33 and 10.55 GHz. These are the highest dynamic range images of the nebula to date. The peak brightness in the 0.33-GHz radio continuum image indicates that the electron temperature is 6800-7600 K. The images clarify the structure of a thermal plume that is directed north from the H ii region and opposite to a unipolar molecular outflow found in the molecular cloud near the H ii region. We report the detection of H91alpha recombination lines from the plume: these data confirm that the plume is blueshifted relative to the molecular cloud. Finally, we discuss the relative merits of three possible explanations for the plume: that the plume results from the blueshifted counterjet to the CO outflow; that the plume is the continuation of the champagne flow observed in the denser parts of the H ii region; and that the plume is produced by the photoevaporation of molecular clumps apparent in a ^13CO map of the region.|
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|Copyright:||(1997) Royal Astronomical Society|
|Appears in Collections:||Research Papers (A&A)|
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