Title:	A thermal plume in NGC 2024
Authors:	Subrahmanyan, Ravi Goss, W.M. Megeath, S.T. Peter, Barnes J.
Keywords:	H II REGIONS, SM: INDIVIDUAL: NGC 2024, ISM: JETS AND OUTFLOWS, RADIO CONTINUUM: ISM, RADIO LINES: ISM
Issue Date:	Sep-1997
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.
Description:	Open Access
URI:	http://hdl.handle.net/2289/1573
ISSN:	0035-8711
Alternative Location:	http://adsabs.harvard.edu/cgi-bin/bib_query?1997MNRAS.290..431S http://adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997MNRAS.290..431S&link_type=ARTICLE&db_key=AST
Copyright:	(1997) Royal Astronomical Society
Appears in Collections:	Research Papers (A&A)

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