HFPK 334: An unusual Supernova Remnant in the Small Magellanic Cloud
We present new Australia Telescope Compact Array (ATCA) radio-continuum and XMM-Newton/Chandra X-ray Observatory (CXO) observations of the unusual supernova remnant HFPK 334 in the Small Magellanic Cloud (SMC). The remnant follows a shell type morphology in the radio-continuum and has a size of $\si...
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| Main Authors: | , , , , , , , |
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| Format: | Journal Article |
| Language: | English |
| Published: |
30-05-2014
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| Subjects: | |
| Online Access: | Get full text |
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| Summary: | We present new Australia Telescope Compact Array (ATCA) radio-continuum and
XMM-Newton/Chandra X-ray Observatory (CXO) observations of the unusual
supernova remnant HFPK 334 in the Small Magellanic Cloud (SMC). The remnant
follows a shell type morphology in the radio-continuum and has a size of
$\sim$20~pc at the SMC distance. The X-ray morphology is similar, however, we
detect a prominent point source close to the center of the SNR exhibiting a
spectrum with a best fit powerlaw with a photon index of $\Gamma = 2.7 \pm
0.5$. This central point source is most likely a background object and cannot
be directly associated with the remnant. The high temperature, nonequilibrium
conditions in the diffuse region suggest that this gas has been recently
shocked and point toward a younger SNR with an age of $\lesssim 1800$ years.
With an average radio spectral index of $\alpha=-0.59\pm0.09$ we find that an
equipartition magnetic field for the remnant is $\sim$90~$\mu$G, a value
typical of younger SNRs in low-density environments. Also, we report detection
of scattered radio polarisation across the remnant at 20~cm, with a peak
fractional polarisation level of 25$\pm$5\%. |
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| DOI: | 10.48550/arxiv.1405.7788 |