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19 April 2024 |
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Radio Observations of Supernova Remnant G1.9+0.3 | | Kieran J. Luken
; Miroslav D. Filipović
; Nigel I. Maxted
; Roland Kothes
; Ray P. Norris
; James R. Allison
; Rebecca Blackwell
; Catherine Braiding
; Robert Brose
; Michael Burton
; Ain Y. De Horta
; Tim J. Galvin
; Lisa Harvey-Smith
; Natasha Hurley-Walker
; Denis Leahy
; Nicholas O. Ralph
; Quentin Roper
; Gavin Rowell
; Iurii Sushch
; Dejan Urošević
; Graeme F. Wong
; | | Date: |
4 Dec 2019 | | Abstract: | We present 1 to 10GHz radio continuum flux density, spectral index,
polarisation and Rotation Measure (RM) images of the youngest known Galactic
Supernova Remnant (SNR) G1.9+0.3, using observations from the Australia
Telescope Compact Array (ATCA). We have conducted an expansion study spanning 8
epochs between 1984 and 2017, yielding results consistent with previous
expansion studies of G1.9+0.3. We find a mean radio continuum expansion rate of
($0.78 pm 0.09$) per cent year$^{-1}$ (or $sim8900$ km s$^{-1}$ at an assumed
distance of 8.5 kpc), although the expansion rate varies across the SNR
perimeter. In the case of the most recent epoch between 2016 and 2017, we
observe faster-than-expected expansion of the northern region. We find a global
spectral index for G1.9+0.3 of $-0.81pm0.02$ (76 MHz$-$10 GHz). Towards the
northern region, however, the radio spectrum is observed to steepen
significantly ($sim -$1). Towards the two so called (east & west) "ears" of
G1.9+0.3, we find very different RM values of 400-600 rad m$^{2}$ and 100-200
rad m$^{2}$ respectively. The fractional polarisation of the radio continuum
emission reaches (19 $pm$ 2)~per~cent, consistent with other, slightly older,
SNRs such as Cas~A. | | Source: | arXiv, 1912.1771 | | Services: | Forum | Review | PDF | Favorites | |
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