Kavli Affiliate: Kejia Lee
| First 5 Authors: Jiangwei Xu, Jinchen Jiang, Heng Xu, Bojun Wang, Zihan Xue
| Summary:
We present polarization pulse profiles for 56 millisecond pulsars (MSPs)
monitored by the Chinese Pulsar Timing Array (CPTA) collaboration using the
Five-hundred-meter Aperture Spherical radio Telescope (FAST). The observations
centered at 1.25 GHz with a raw bandwidth of 500 MHz. Due to the high
sensitivity ($sim$16 K/Jy) of the FAST telescope and our long integration
time, the high signal-to-noise ratio polarization profiles show features hardly
detected before. Among 56 pulsars, the polarization profiles of PSRs
J0406$+$3039, J1327$+$3423, and J2022$+$2534 were not previously reported. 80%
of MSPs in the sample show weak components below 3% of peak flux, 25% of
pulsars show interpulse-like structures, and most pulsars show linear
polarization position angle jumps. Six pulsars seem to be emitting for full
rotation phase, with another thirteen pulsars being good candidates for such a
360$^circ$ radiator. We find that the distribution of the polarization
percentage in our sample is compatible with the normal pulsar distribution. Our
detailed evaluation of the MSP polarization properties suggests that the wave
propagation effects in the pulsar magnetosphere are important in shaping the
MSP polarization pulse profiles.
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