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Luken et al. present 1 to 10 GHz radio continuum flux density,
spectral index, polarisation and Rotation Measure images of the
youngest known Galactic (SNR) G1.9+0.3, using observations from the
ATCA.
The fractional polarisation of the radio continuum emission reaches
(19 ± 2) per cent, consistent with other, slightly older, SNRs such as Cas A.
Towards the two so-called "ears" (to the east & west) of G1.9+0.3, very
different RM values are found, of around 500 rad/m2 and 150 rad/m2 respectively.
The image above shows the 2016 (6B array) observations at 2.1 GHz as
the greyscale image, with contours taken from the 2017 (6A array)
observations at the same frequency. Contour levels are 3, 5, 7, 10,
15, 20, 25, 30 and 40 times the standard deviation of 0.16
mJy/beam. An enhanced expansion rate between the two epochs to the
north (top) is visible.
More details are given in
the paper,
to be published in Monthly Notices of the Royal Astronomical Society.
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