Supernova remnants in M33

Astronomy and Astrophysics – Astronomy

Scientific paper

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Radio Sources (Astronomy), Supernova Remnants, Astronomical Maps, Astronomical Photography, Forbidden Transitions, H Alpha Line, H Ii Regions, Radiant Flux Density

Scientific paper

Three supernova remnants (SNR) have been identified in a field 8 arcmin in diameter centered on the southern arm of M33. The SNR were detected on the basis of strong forbidden S II emission using a set of plates in narrow-band H-alpha and forbidden S II light and in blue, green, and red broadband colors. These objects are the three strongest radio sources in that field in the high-resolution 21-cm radio map of M33 obtained by Israel and van der Kruit (1974). From this result it appears that SNR may seriously contaminate H II region population counts based on radio fluxes in M33.

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