G332.5−5.6, a new Galactic supernova remnant |
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| Authors: | E M Reynoso † A J Green |
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| Institution: | Instituto de Astronomía y Física del Espacio (IAFE), CC 67, Suc. 28, 1428 Buenos Aires, Argentina;Departamento de Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina;School of Physics, University of Sydney, NSW 2006, Australia |
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| Abstract: | We present radio observations of the source G332.5?5.6, a candidate supernova remnant (SNR). Observations have been performed with the Australia Telescope Compact Array (ATCA) at two frequencies, 1.4 and 2.4 GHz. Our results confirm that G332.5?5.6 is an SNR, with a spectral index α=?0.7 ± 0.2 for the whole source and an average fractional polarization of ～35 per cent at 2.4 GHz. The central component is coincident with extended X-ray emission, and the distance to the SNR is estimated to be ～3.4 kpc. Based on its radio and X-ray morphology, this SNR should be classified as a composite, and we suggest that it belongs to a trident-shaped subclass like G291.0?0.1. |
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| Keywords: | polarization ISM: individual: G332 5–5 6 supernova remnants radio continuum: general |
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