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Title: HFPK 334: An unusual supernova remnant in the Small Magellanic Cloud

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%.
Authors:
;  [1] ; ; ; ;  [2] ;  [3] ;  [4]
  1. University of Western Sydney (Australia)
  2. Department of Physics and Astronomy, University of Iowa, Iowa City, IA 52242 (United States)
  3. Max-Planck-Institut für extraterrestrische Physik, Giessenbachstraße, D-85748 Garching (Germany)
  4. Department of Astronomy, Faculty of Mathematics, University of Belgrade, Studentski trg 16, 11000 Belgrade (Serbia)
Publication Date:
OSTI Identifier:
22342218
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astronomical Journal (New York, N.Y. Online); Journal Volume: 148; Journal Issue: 5; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; AUSTRALIA; DENSITY; DETECTION; DISTANCE; MAGELLANIC CLOUDS; MAGNETIC FIELDS; PEAKS; PHOTONS; PULSARS; SPECTRA; SUPERNOVA REMNANTS; TELESCOPES; X RADIATION