Low-frequency observations of the Vela supernova remnant and their implications |
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Authors: | K S Dwarakanath |
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Institution: | 1. Raman Research Institute, 560080, Bangalore 2. National Radio Astronomy Observatory, P.O. Box 0, Socorro, New Mexico, USA
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Abstract: | We have studied the Vela supernova remnant in the light of the 34.5 MHz observations made with the GEETEE low frequency array. The flux densities of Vela X and YZ at 34.5 MHz are estimated to be 1800 and 3900 Jy respectively. These values, along with those from earlier observations at higher frequencies, imply spectral indices (S∞Να) of-0.16 ± 0.02 for Vela X and -0.53 ± 0.03 for Vela YZ. This situation is further substantiated by the spectral-index distribution over the region obtained between 34.5 and 408 MHz. The spectral-index estimates, along with other known characteristics, strengthen the earlier hypothesis that Vela X is a plerion, while Vela YZ is a typical shell-type supernova remnant. We discuss the implications of this result. |
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