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9th of October 2018
ATCA imaging of the SN1987A remnant
(by Cendes et al.)
Cendes et al. report on updated radio imaging observations of the radio remnant of Supernova 1987A (SN 1987A) at 9 GHz, taken with the Australia Telescope Compact Array (ATCA), covering the 25-year period from 1992 to 2017. This monitoring program project is one of the longest running programs with the ATCA. The supernova remnant continues to brighten and expand. Cendes et al. try fiting both a torus model and a ring model to the data, favouring a torus model, which reveals a change in the remnant expansion in 2013 from about 2,300 km/s to 3,610 km/s. They also see an increase in the brightness of the western lobe of the remnant, in contrast to contemporary optical and X-ray observations. The authors predict a reversal in this asymmetry in several years' time, as the south-eastern side of the remnant is now beginning to fade. More details are available from the preprint, with the paper accepted for publication in the Astrophysical Journal.

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