Kavli Affiliate: Kejia Lee
| First 5 Authors: Shunshun Cao, Jinchen Jiang, Jaroslaw Dyks, Longfei Hao, Kejia Lee
| Summary:
As one of the paradigm examples to probe into pulsar magnetospheric dynamics,
PSR B0943+10 (J0946+0951) manifests representatively, showing mode switch,
orthogonal polarization and subpulse drifting. Both integrated and single
pulses are studied with the Five-hundred-meter Aperture Spherical radio
Telescope (FAST). The mode switch phenomenon of this pulsar is studied using an
eigen-mode searching method, based on parameter estimation. A phase space
evolution for the pulsar’s mode switch shows a strange-attractor-like pattern.
The radiative geometry is proposed by fitting polarization position angles with
the rotating vector model. The pulsar pulse profile is then mapped to the
sparking location on pulsar surface, and the differences between the main
pulse’s and the precursor component’s radiative process may explain the X-ray’s
synchronization with radio mode switch. Detailed single pulse studies on
B0943+10’s orthogonally polarized radiation are presented, which may support
for certain models of radiative transfer of polarized emission. B0943+10’s B
and Q modes evolve differently with frequency and with proportions of
orthogonal modes, which indicates possible magnetospheric changes during mode
switch. An extra component is found in B mode, and it shows distinct
polarization and modulation properties compared with main part of B mode pulse
component. For Q mode pulse profile, the precursor and the main pulse
components are orthogonally polarized, showing that the precursor component
radiated farther from the pulsar could be radiated in O-mode (X-mode) if the
main pulse originates from low altitude in X-mode (O-mode). The findings could
impact significantly on pulsar electrodynamics and the radiative mechanism
related.
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