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arXiv 2401.12909astro-ph.HE
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磁星 Swift J1818.0-1607 的射电脉冲轮廓演化

Radio Pulse Profile Evolution of Magnetar Swift J1818.0-1607

Rebecca Fisher, Elliot Butterworth, Kaustubh Rajwade, Ben Stappers, Gregory Desvignes, Ramesh Karuppusamy, Michael Kramer, Kuo Liu, Andrew Lyne, Mitchell Mickal… 展开作者

Rebecca Fisher, Elliot Butterworth, Kaustubh Rajwade, Ben Stappers, Gregory Desvignes, Ramesh Karuppusamy, Michael Kramer, Kuo Liu, Andrew Lyne, Mitchell Mickaliger, Benjamin Shaw, Patrick Weltevrede

AI总结:

本文利用高斯过程回归和 Lomb-Scargle 周期图分析 Swift J1818.0-1607 的射电脉冲轮廓与自转减速率,发现三种轮廓模式及偏振变化,支持局部磁层变化而非进动解释。

摘要:

射电噪磁星射电脉冲轮廓的形状和偏振特性为研究其磁层性质提供了独特机会。本文采用高斯过程回归分析,研究磁星 Swift J1818.0-1607 射电脉冲轮廓总强度形状的变化。结果发现,在 MJD 59104 至 59365 之间,观测到的轮廓形状通过三种模式演化。这些转变发生的时间与自转减速率调制幅度的变化相吻合。线偏振和圆偏振的程度也被发现随时间显著变化。对自转减速率的 Lomb-Scargle 周期图分析揭示了三个可能存在谐波关系的频率,这可能表明该磁星正在经历地震活动。然而,没有任何轮廓特征表现出显著的周期性,这表明在各模式内的较短时间尺度上,轮廓变化与自转减速波动之间不存在简单相关性。总体而言,这意味着所观测到的模式变化是局部磁层变化的结果,而进动等其他理论较难解释这些观测结果。

英文摘要:

The shape and polarisation properties of the radio pulse profiles of radio-loud magnetars provide a unique opportunity to investigate their magnetospheric properties. Gaussian Process Regression analysis was used to investigate the variation in the total intensity shape of the radio pulse profiles of the magnetar Swift J1818.0-1607. The observed profile shape was found to evolve through three modes between MJDs 59104 and 59365. The times at which these transitions occurred coincided with changes in the amplitude of modulations in the spin-down rate. The amount of linear and circular polarisation was also found to vary significantly with time. Lomb-Scargle periodogram analysis of the spin-down rate revealed three possibly harmonically related frequencies. This could point to the magnetar experiencing seismic activity. However, no profile features exhibited significant periodicity, suggesting no simple correlations between the profile variability and fluctuations of the spin-down on shorter timescales within the modes. Overall, this implies the mode changes seen are a result of local magnetospheric changes, with other theories, such as precession, less able to explain these observations.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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