Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radio Emission from Interstellar Shocks: Young Type Ia Supernova
  Remnants and the Case of N 103B in the Large Magellanic Cloud   Here we present a radio continuum study based on new and archival data from
the Australia Telescope Compact Array towards N 103B, a young (<=1000 yrs)
spectroscopically confirmed type Ia SNR in the Large Magellanic Cloud (LMC) and
proposed to have originated from a single degenerate progenitor. The radio
morphology of this SNR is asymmetrical with two bright regions towards the
north-west and south-west of the central location as defined by radio emission.
  N 103B identified features include: a radio spectral index of -0.75+-0.01
(consistent with other young type Ia SNRs in the Galaxy); a bulk SNR expansion
rate as in X-rays; morphology and polarised electrical field vector
measurements where we note radial polarisation peak towards the north-west of
the remnant at both 5500 and 9000 MHz. The spectrum is concave-up and the most
likely reason is the non-linear diffusive shock acceleration effects or
presence of two different populations of ultra-relativistic electrons.
  We also note unpolarized clumps near the south-west region which is in
agreement with this above scenario. We derive a typical magnetic field strength
for N 103B, of 16.4 microG for an average rotation measurement of 200 rad m^-2.
However, we estimate the equipartition field to be of the order of ~235 microG
with an estimated minimum energy of Emin=6.3*10^48 erg. The close (~0.5 degree)
proximity of N 103B to the LMC mid-plane indicates that an early encounter with
dense interstellar medium may have set an important constrain on SNR evolution.
  Finally, we compare features of N 103B, to six other young type Ia SNRs in
the LMC and Galaxy, with a range of proposed degeneracy scenarios to highlight
potential differences due to a different models. We suggest that the single
degenerate scenario might point to morphologically asymmetric type Ia supernova
explosions.

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The categories of this paper are: funct-an
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The categories of this paper are: hep-lat
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The categories of this paper are: solv-int
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The categories of this paper are: nucl-th
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The categories of this paper are: adap-org
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The categories of this paper are: chem-ph
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The categories of this paper are: alg-geom
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The categories of this paper are: atom-ph
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The categories of this paper are: physics