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arXiv 1710.09548astro-ph.HE
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PSRs J1741-0840和J1840-0840中的零化、漂移及其相互作用

On the nulling, drifting, and their interactions in PSRs J1741-0840 and J1840-0840

Gajjar Vishal, J. P. Yuan, R. Yuen, Z. G. Wen, Z. Y. Liu, N. Wang

摘要:

本文详细研究了在625 MHz的巨型米波射电望远镜上观测到的两颗双星PSR J1741-0840和J1840-0840的零化和漂移行为。发现PSR J1741-840显示约30(5)%的无效分数(NF),而PSR J1840-0840显示约50(6)%的NF。我们首次测量了PSR J1840-0840中不同剖面分量的漂移行为,其中领先分量显示漂移13.5(0.7)个周期,而弱拖尾分量显示漂移约18(1)个周期。大的零点确实妨碍使用标准傅立叶技术导出的这些量的准确性。一个更准确的比较是从漂移带斜率,测量后,子脉冲建模。这些测量结果揭示了有趣的零星和不规则的漂移行为,在这两个恒星。我们的结论是,以前报道的不同漂移周期的PSR J1741-0840的拖尾分量可能是由于这些漂移带斜率的传播。我们还发现,PSR J1840-0840的两个组件显示出相似的漂移带斜率的不确定性。在PSR J1840-0840中确定了独特的零漂移相互作用,在大多数情况下,脉冲星倾向于在似乎是漂移带结束后开始零漂移。类似地,当脉冲星切换回发射阶段时,在大多数情况下,它开始于两个分量中新漂移带的开始。据我们所知,此类行为在任何其他地方都没有发现。我们还发现,PSR J1741-0840似乎没有其先前的突发相位的记忆,而PSR J1840-0840清楚地表现出其先前状态的记忆,即使在两个分量的较长的空值之后。我们讨论了这些有趣的零漂移相互作用的可能的解释,在这两个脉冲星的基础上,各种脉冲星零模型。

英文摘要:

We report detailed investigation of nulling and drifting behavior of two pulsars PSRs J1741-0840 and J1840-0840 observed from the Giant Meterwave Radio Telescope at 625 MHz. PSR J1741-840 was found to show nulling fraction (NF) of around 30(5)% while PSR J1840-0840 was shown to have NF of around 50(6)%. We measured drifting behavior from different profile components in PSR J1840-0840 for the first time with the leading component showing drifting with 13.5(0.7) periods while the weak trailing component showed drifting of around 18(1) periods. Large nulling do hamper accuracy of these quantities derived using standard Fourier techniques. A more accurate comparison was drawn from driftband slopes, measured after sub-pulse modeling. These measurements revealed interesting sporadic and irregular drifting behavior in both pulsars. We conclude that the previously reported different drifting periodicities in the trailing component of PSR J1741-0840 is likely due to the spread in these driftband slopes. We also find that both components of PSR J1840-0840 show similar driftband slopes within the uncertainties. Unique nulling-drifting interaction is identified in PSR J1840-0840 where, in most occasions, the pulsar tends to start nulling after what appears to be an end of a driftband. Similarly, when the pulsar switches back to an emission phase, in most occasions it starts at the beginning of a new driftband in both components. Such behaviors have not been detected in any other pulsars to our knowledge. We also found that PSR J1741-0840 seems to have no memory of its previous burst phase while PSR J1840-0840 clearly exhibits memory of its previous state even after longer nulls for both components. We discuss possible explanations for these intriguing nulling-drifting interactions seen in both pulsars based on various pulsar nulling models.

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