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Title: | HFPK 334: An unusual supernova remnant in the small magellanic cloud | Authors: | Crawford, E. J. Filipović, M. D. McEntaffer, R. L. Brantseg, T. Heitritter, K. Roper, Q. Haberl, F. Urošević, Dejan |
Affiliations: | Astronomy | Keywords: | ISM: individual objects (HFPK 334);ISM: supernova remnants;pulsars: general | Issue Date: | 1-Nov-2014 | Journal: | Astronomical Journal | Abstract: | We present new Australia Telescope Compact Array radio-continuum and XMM-Newton/Chandra X-ray Observatory observations of the unusual supernova remnant (SNR) HFPK 334 in the Small Magellanic Cloud (SMC). The remnant follows a shell-type morphology in the radio continuum and has a size of ∼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 power law with a photon index of Γ = 2.7 ± 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 points toward a younger SNR with an age of ≲ 1800 yr. With an average radio spectral index of α = -0.59 ± 0.09, we find that an equipartition magnetic field for the remnant is ∼90 μG, a value typical of younger SNRs in low-density environments. Also, we report the detection of scattered radio polarization across the remnant at 20 cm, with a peak fractional polarization level of 25% ± 5%. |
URI: | https://research.matf.bg.ac.rs/handle/123456789/252 | ISSN: | 00046256 | DOI: | 10.1088/0004-6256/148/5/99 |
Appears in Collections: | Research outputs |
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