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Aims.We investigate whether the morphology of bilateral supernova remnants
(BSNRs) observed in the radio band is determined mainly either by
a non-uniform interstellar medium (ISM) or by a non-uniform ambient
magnetic field.
Methods.We perform 3D MHD simulations of a spherical SNR shock
propagating through a magnetized ISM. Two cases of shock propagation
are considered: 1) through a gradient of ambient density with a
uniform ambient magnetic field; 2) through a homogeneous medium with
a gradient of ambient magnetic field strength. From the simulations,
we synthesize the synchrotron radio emission, making different
assumptions about the details of acceleration and injection
of relativistic electrons.
Results.We find that asymmetric BSNRs are produced if the line-of-sight is
not aligned with the gradient of ambient plasma density or with the
gradient of ambient magnetic field strength. We derive useful
parameters to quantify the degree of asymmetry of the remnants that
may provide a powerful diagnostic of the microphysics of strong shock
waves through the comparison between models and observations.
Conclusions.BSNRs with two radio limbs of different brightness can be explained
if a gradient of ambient density or, most likely, of ambient magnetic
field strength is perpendicular to the radio limbs. BSNRs with
converging similar radio arcs can be explained if the gradient runs
between the two arcs
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