A remarkable H II region complex in NGC 2366

Astronomy and Astrophysics – Astronomy

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Galaxies, H Ii Regions, Nebulae, Abundance, Emission Spectra, H Alpha Line, Late Stars, Markarian Galaxies, Stellar Evolution, Stellar Luminosity, Stellar Spectrophotometry

Scientific paper

An optical and radio study of NGC 2363, a very large H II region complex in the dwarf galaxy NGC 2366, is reported. The emission-line spectrum of NGC 2363 is unusual in its extremely high degree of excitation and very low amount of reddening. It indicates a very low metal abundance, but also suggests an unusually energetic source of ionization. The unusual spectrum and huge size of the H II region is very reminiscent of the more distant narrow-lined Markarian galaxies and the 'isolated extragalactic H II regions'.

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