Australia Telescope Observations of the CTB 33 Complex

Astronomy and Astrophysics – Astronomy

Scientific paper

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Ism: H Ii Regions, Ism: Individual Alphanumeric: Ctb 33, Radio Continuum: Ism, Radio Lines: Ism, Ism: Supernova Remnants

Scientific paper

We present high-resolution radio continuum, H I absorption, and H90 alpha recombination line observations of the CTB 33 complex and nearby sources (l = 337 deg, b = 0 deg) taken with the Australia Telescope Compact Array. We estimate distances to several discrete sources on the basis of H I absorption spectra. Radio recombination lines are detected for two sources in the field. The compact source G337.0-0.1 in the CTB 33 complex, whose nature was previously in doubt, is identified as a supernova remnant with a diameter of ~5 pc. This classification is based on several contributing features: a nonthermal spectral index (-0.6), a shell structure, and the absence of detectable recombination lines. In addition, a 1720 MHz OH maser is probably associated with G337.0-0.1. We conclude that the CTB 33 region is a supernova remnant--H II complex at a distance of ~11 kpc.

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