Emission variation study of some millisecond pulsars using FAST
Wang, Shuangqiang
We used FAST to observe three millisecond pulsars and found periodical modulations in all of them for the first time.The modulation periods are 87 ms and 5.78 s for PSR J0621+1002, 248 ms for PSR 0636+5129. PSR J0030+0451 is the first periodical mode changing millisecond pulsar with the mode-cycle timescale of only 25 ms which is the shortest in all mode changing pulsars.
We examined the achievable timing precision using only the bright pulses. No significant improvement in timing precision was found for PSR J0621+1002 and PSR J0636+5129. The timing precision available for PSR J0030+0451 improved about 1%.