Variability, polarimetry, and timing properties of single pulses from PSR J2222-0137 using FAST

X. L. Miao, W. W. Zhu, M. Kramer, P. C. C. Freire, L. Shao, M. Yuan, L. Q. Meng, Z. W. Wu, C. C. Miao, Y. J. Guo, D. J. Champion, E. Fonseca, J. M. Yao, M. Y. Xue, J. R. Niu, H. Hu, C. M. Zhang

Published 2023-08-21Version 1

In our work, we analyse $5\times10^{4}$ single pulses from the recycled pulsar PSR J2222$-$0137 in one of its scintillation maxima observed by the Five-hundred-meter Aperture Spherical radio Telescope (FAST). PSR J2222$-$0137 is one of the nearest and best studies of binary pulsars and a unique laboratory for testing gravitational theories. We report single pulses' energy distribution and polarization from the pulsar's main-pulse region. The single pulse energy follows the log-normal distribution. We resolve a steep polarization swing, but at the current time resolution ($64\,\mu{\rm s}$), we find no evidence for the orthogonal jump in the main-pulse region, as has been suspected. We find a potential sub-pulse drifting period of $P_{3} \sim 3.5\,P$. We analyse the jitter noise from different integrated numbers of pulses and find that its $\sigma_{j}$ is $270\pm{9}\,{\rm ns}$ for 1-hr integration at 1.25 GHz. This result is useful for optimizing future timing campaigns with FAST or other radio telescopes.