论文标题
三毫秒脉冲星的单脉冲研究
Single-pulse studies of three millisecond pulsars
论文作者
论文摘要
单脉冲研究对于在精确时机中了解脉冲星排放机制和噪声底非常重要。我们研究了三个明亮的毫秒脉冲星的总强度和极化特性-PSRS J1022+1001，J1713+0747和B1855+09-在多个频率下具有可检测到的单个脉冲。我们首次报告了PSRS J1022+1001和J1713+0747的单个脉冲的检测。此外，对于这两个脉冲星，平均轮廓中线性极化的比例在4.5 GHz时显着降低，而1.38 GHz可以支持靠近Pulsar表面的偶极场的预期偏差。 PSR J1713+0747的单个脉冲中有一些正交模式的暗示。更灵敏的多频观测可能对确认这些发现很有用。 PSRS J1022+1001，J1713+0747和B1855+09的抖动噪声贡献为1.38 GHz，缩放到一小时，分别为〜135 ns，〜45 ns和〜60 ns，并且与以前的研究一致。我们还表明，PSR J1022+1001的选择性明亮脉冲时序可改善〜22 $μ$ s的根平方残留物，这比单独使用单个脉冲的时间要高约3。
Single-pulse studies are important to understand the pulsar emission mechanism and the noise floor in precision timing. We study total intensity and polarimetry properties of three bright millisecond pulsars - PSRs J1022+1001, J1713+0747, and B1855+09 - that have detectable single pulses at multiple frequencies. We report for the first time the detection of single pulses from PSRs J1022+1001 and J1713+0747 at 4.5 GHz. In addition, for those two pulsars the fraction of linear polarization in the average profile is significantly reduced at 4.5 GHz, compared to 1.38 GHz, which could support the expected deviation from a dipolar field closer to the pulsar surface. There is a hint of orthogonal modes in the single pulses of PSR J1713+0747. More sensitive multi-frequency observations may be useful to confirm these findings. The jitter noise contributions at 1.38 GHz, scaled to one hour, for PSRs J1022+1001, J1713+0747 and B1855+09 are ~135 ns, ~45 ns, and ~60 ns respectively and are consistent with previous studies. We also show that selective bright-pulse timing of PSR J1022+1001 yields improved root-mean-square residuals of ~22 $μ$s, which is a factor of ~3 better than timing using single pulses alone.
