Anomalous emission regions in irregular galaxies

Details Anomalous emission regions in irregular galaxies Anomalous emission regions in irregular galaxies

Jan 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984apj...276l..35h&link_type=abstract

Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 276, Jan. 15, 1984, p. L35-L39. Research supported

Astronomy and Astrophysics

Astrophysics

19

Astronomical Photometry, Galactic Structure, Stellar Evolution, Anomalies, Emission Spectra, H Alpha Line, H Ii Regions, Supernova Remnants

Scientific paper

Spectrophotometric data are presented for regions in the irregular galaxies NGC 3738, NGC 4214, and NGC 4449. In the H II regions, the ratios of the forbidden emissions at 3727 A (O II) and 5007 A (O III) are less than 2, while the inter-H II-region spectra have ratios greater than 2. Of the latter, six have oxygen ratios greater than about 4. The mechanism responsible for such high line ratios is explored, and it is found that these regions are unlike models of both shock-heated gas and normal H II regions.

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