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Bozzetto et al. present a new ASKAP
sample of 14 radio supernova remnants (SNR) candidates in the Large
Magellanic Cloud (LMC). This new sample is a significant increase to
the known number of older, larger, and low surface brightness LMC
SNRs. A multi-frequency study was made for each object and
possible traces of optical and occasionally X-ray emission found in several
of the candidates.
They also investigate a sample of 20 previously suggested
LMC SNR candidates and confirm the SNR nature of one of these.
Lower surface brightness SNR candidates were detected which were
likely formed by a combination of shock waves and strong stellar winds
from massive progenitors (possibly OB stars).
Some of
the new SNR candidates are found in lower density environments in
which type Ia supernovae may have exploded inside a previously excavated
cavity in the interstellar medium.
The figure shows ASKAP radio images of 2 of the newly discovered LMC SNRs candidates.
The tick intervals of 1 arcmin on the x- and y-axes
correspond to 14.5 parsecs (47 light years) at the distance of the LMC.
The colour bar is shown at the bottom of the panel. The intensity ranges
for the 2 panels are −0.4 to 1.0 mJy/beam (left) and −0.3 to 1.5 mJy/beam (right).
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