Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1985
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985apj...290..449s&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 290, March 15, 1985, p. 449-461.
Astronomy and Astrophysics
Astrophysics
85
Extragalactic Radio Sources, H Ii Regions, Interstellar Gas, Nebulae, Spiral Galaxies, Supernova Remnants, Abundance, Galactic Structure, Gas Temperature, H Lines, Imaging Techniques, Red Shift, Stellar Spectrophotometry, Wolf-Rayet Stars
Scientific paper
The giant extragalactic H II region NGC 5471 in M 101 has been observed with high spatial resolution at both optical and radio wavelengths. Variations are found in reddening, gas temperature, ionic abundances, and stellar populations. Evidence for a supernova remnant has been discovered. These results are discussed with regard to previous research on extragalactic H II regions. An upper limit on the presence of Wolf-Rayet stars in NGC 5471 implies that the winds of Wolf-Rayet stars are not solely responsible for the large velocity dispersions in the ionized gas. It is shown that the presence of a supernova may be difficult to detect using standard methods; however, a supernova remnant will alter the results of estimates of physical conditions and chemical abundances.
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