乌鲁木齐天文台探测到29个小故障
29 Glitches Detected at Urumqi Observatory
摘要：
介绍了2002年7月至2008年12月乌鲁木齐天文台南山射电望远镜脉冲星计时观测中发现的毛刺现象。总共在19个年轻的卫星上检测到29个故障，这是其中12个卫星首次检测到故障。分数毛刺幅度范围从10^{-11}到3.9 x 10^{-6}的几个部分。在PSR J 0631 +1036、B1822-09和B1907+10中确定了三个“缓慢”毛刺。脉冲星与脉冲星之间以及同一脉冲星中的不同故障的故障后恢复差异很大。大多数大的故障显示出在100 - 1000天的时间尺度上指数故障后恢复的一些证据，但在某些情况下，例如，PSR B1758-23，几乎没有回收。除了指数恢复之外，对于PSR B1800-21和B1823-13中的两个大故障，可以看到减速率的永久性增加。这些和其他几个脉冲星也显示出部分指数恢复后的nudot线性增加，这与船帆座脉冲星的故障后行为相似。对已知毛刺的整个样本的分析表明，分数毛刺幅度与特征年龄相关，峰值在10^5岁左右，但在所有年龄段都有两到三个数量级的分布。毛刺活动与自旋下降率正相关，再次与广泛的值。
英文摘要：
Glitches detected in pulsar timing observations at the Nanshan radio telescope of Urumqi Observatory between 2002 July and 2008 December are presented. In total, 29 glitches were detected in 19 young pulsars, with this being the first detection of a glitch in 12 of these pulsars. Fractional glitch amplitudes range from a few parts in 10^{-11} to 3.9 x 10^{-6}. Three "slow" glitches are identified in PSRs J0631+1036, B1822-09 and B1907+10. Post-glitch recoveries differ greatly from pulsar to pulsar and for different glitches in the same pulsar. Most large glitches show some evidence for exponential post-glitch recovery on timescales of 100 -- 1000 days, but in some cases, e.g., PSR B1758-23, there is little or no recovery. Beside exponential recoveries, permanent increases in slowdown rate are seen for the two large glitches in PSRs B1800-21 and B1823-13. These and several other pulsars also show a linear increase in nudot following the partial exponential recovery, which is similar to the Vela pulsar post-glitch behaviour. Analysis of the whole sample of known glitches show that fractional glitch amplitudes are correlated with characteristic age with a peak at about 10^5 years, but there is a spread of two or three orders of magnitude at all ages. Glitch activity is positively correlated with spin-down rate, again with a wide spread of values.
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