A connection between radio state changing and glitch activity in PSR J0742−2822
A connection between radio state changing and glitch activity in PSR J0742−2822
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DOI：
10.1093/mnras/stt660
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发表时间：
2013-04
影响因子：
4.8
通讯作者：
M. Keith;R. Shannon;S. Johnston
中科院分区：
文献类型：
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作者：
M. Keith;R. Shannon;S. Johnston
PSR J0742-2822表现出两种不同的发射状态，通过观测到的脉冲分布的离散变化来识别。这些变化先前已被证明与脉冲频率导数的变化有关。在本文中，我们利用帕克斯射电望远镜在1369和3100 MHz的中心频率上的观测结果，为这两种模式产生了高相位分辨率的偏振曲线，并对观测到的脉冲形状和自旋下降速率之间的相关性进行了详细的研究。我们发现在MJD 550 22的脉冲星发生突变之前至少200天没有相关性，之后相关性变得很强。这表明排放状态转换现象与故障事件之间存在联系。我们讨论了发射态转换是由磁层和中子星内部的相互作用驱动的可能性。
PSR J0742-2822 exhibits two distinct emission states that are identifiedby discrete changes in the observed pulse profile. These changes havepreviously been shown to correlate with changes in the derivative of thepulse frequency. In this paper, we use observations with the Parkesradio telescope at a centre frequency of 1369 and 3100 MHz to producehigh phase resolution polarization profiles for the two modes andperform a detailed study of the correlation between observed pulse shapeand spin-down rate. We find no correlation for at least 200 d prior to aglitch in the pulsar at MJD 550 22, following which the correlationbecomes strong. This suggests a link between the emission stateswitching phenomenon and glitch events. We discuss the possibility thatemission state switching is driven by the interaction between themagnetosphere and the interior of the neutron star.