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Abstract: The aftermath of supernova SN 1987A continues to provide spectacularinsights into the interaction between a SN blastwave and its circumstellar en-vironment. We here present 36 GHz observations from the Australia TelescopeCompact Array of the radio remnant of SN 1987A. These new images, taken in 2008Apr and 2008 Oct, substantially extend the frequency range of an ongo- ingmonitoring and imaging program conducted between 1.4 and 20 GHz. Our 36.2 GHzimages have a diffraction-limited angular resolution of 0.3-0.4 arcseconds,which covers the gap between high resolution, low dynamic range VLBI images ofthe remnant and low resolution, high dynamic range images at frequenciesbetween 1 and 20 GHz. The radio morphology of the remnant at 36 GHz is anelliptical ring with enhanced emission on the eastern and western sides,similar to that seen previously at lower frequencies. Model fits to the data inthe Fourier domain show that the emitting region is consistent with a thickinclined torus of mean radius 0.85 arcsec, and a 2008 Oct flux density of 27+- 6 mJy at 36.2 GHz. The spectral index for the remnant at this epoch,determined between 1.4 GHz and 36.2 GHz, is -0.83. There is tentative evidencefor an unresolved central source with flatter spectral index.



Author: T. M. Potter, L. Staveley-Smith, C.-Y. Ng, Lewis Ball, B. M. Gaensler, M. J. Kesteven, R. N. Manchester, A. K. Tzioumis, G. Zanar

Source: https://arxiv.org/



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