Thursday, October 11, 2012

1210.2781 (A. Y. De Horta et al.)

Radio confirmation of Galactic supernova remnant G308.3-1.4    [PDF]

A. Y. De Horta, J. D. Collier, M. D. Filipovic, E. J. Crawford, D. Urosevic, F. H. Stootman, N. F. H. Tothill
We present radio-continuum observations of the Galactic supernova remnant (SNR) candidate, G308.3-1.4, made with the Australia Telescope Compact Array, Molonglo Observatory Synthesis Telescope and the Parkes radio telescope. Our results combined with Chandra X-ray images confirm that G308.3-1.4 is a bona fide SNR with a shell morphology. The SNR has average diameter of D = 34 +- 19 pc, radio spectral index of alpha = -0.68 +- 0.16 and linear polarisation of 10 +- 1%; We estimate the SNR magnetic field B = 29 uG. Employing a Sigma-D relation, we estimate a distance to G308.3-1.4 of d = 19 +- 11 kpc. The radio morphology, although complex, suggests a smaller size for the SNR than previously implied in an X-Ray study. These results imply that G308.3-1.4 is a young to middle-aged SNR in the early adiabatic phase of evolution.
View original: http://arxiv.org/abs/1210.2781

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