RRAT J1819-1458中的异常故障活动：磁星耗尽？
Unusual glitch activity in the RRAT J1819-1458: an exhausted magnetar?
摘要：
我们提出了一个分析的定期定时观测的高磁场旋转无线电瞬变（RRAT）J1819 $-$ 1458使用64米帕克斯和76米洛弗尔射电望远镜在过去的五年。在这段时间内，RRAT遭受了两次明显的故障，频率变化分数分别为$0.6\times10^{-6}$和$0.1\times10^{-6}$。这种量级的闪变是射电望远镜和磁星都显示的现象。然而，J1819 $-$ 1458在这些小故障之后的行为与其他中子星中的小故障之后的行为完全不同，因为小故障活动导致了慢化率的显著长期净下降。如果这种故障每30年发生一次，那么自旋下降速率，以及由此推断的磁偶极矩，将在几千年的时间尺度上降至零。脉冲检测的速率和紧接在毛刺之后的无线电脉冲能量也有显著的增加。
英文摘要：
We present an analysis of regular timing observations of the high-magnetic-field Rotating Radio Transient (RRAT) J1819$-$1458 obtained using the 64-m Parkes and 76-m Lovell radio telescopes over the past five years. During this time, the RRAT has suffered two significant glitches with fractional frequency changes of $0.6\times10^{-6}$ and $0.1\times10^{-6}$. Glitches of this magnitude are a phenomenon displayed by both radio pulsars and magnetars. However, the behaviour of J1819$-$1458 following these glitches is quite different to that which follows glitches in other neutron stars, since the glitch activity resulted in a significant long-term net decrease in the slow-down rate. If such glitches occur every 30 years, the spin-down rate, and by inference the magnetic dipole moment, will drop to zero on a timescale of a few thousand years. There are also significant increases in the rate of pulse detection and in the radio pulse energy immediately following the glitches.
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