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http://hdl.handle.net/2289/1573
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) |
Files in This Item:
File | Description | Size | Format | |
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1997_MNRAS_Vol.290_p431.pdf | Open Access | 1.17 MB | Adobe PDF | View/Open |
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