2000年7月蟹状星云脉冲星闪变的RXTE/HEXTE分析
RXTE/HEXTE Analysis of the Crab Pulsar Glitch of July 2000
摘要：
硬X射线数据从RXTE天文台（HEXTE能量范围15至240千电子伏）进行了分析，以获得一个相位相干的时间解决方案的螃蟹脉冲星毛刺的2000年7月15日。其结果是：（1）在毛刺出现时，蟹状星云脉冲星旋转频率$ν_0$的阶跃变化是$Δν_0 = (30 \pm 3) \times 10^{-9} \times ν_0$，（2）其时间导数的阶跃变化是$Δ\dot ν_0 = (4.8 \pm 0.6) \times 10^{-3} \times \dot ν_0$，（3）阶跃变化的衰减时间尺度是$τ_d = 4.7 \pm 0.5$天。前两个结果与Jodrell Bank天文台在射频上获得的结果一致。最后一个结果没有在文献中引用，但可能是一个低估，由于缺乏非常接近毛刺时期的观察。通过与Jodrell小组公布的蟹状星云脉冲星的月星历表比较，估计了硬X射线和射电脉冲轮廓的主峰之间的时间延迟为$+411 \pm 167$ $μ$ sec.虽然这个数字不是很重要，但它与使用RXTE的PCA仪器得出的2至16 keV能量范围的数字一致。蟹状星云脉冲星的积分脉冲轮廓的两个峰之间的分离，以及它们的强度比，在毛刺前后都是统计上相似的。积分脉冲轮廓内的死区时间校正的积分光子通量似乎在毛刺之后减小，尽管这不是统计上强的结果。这项工作实现了什么可以被认为是几乎绝对的蟹状星云脉冲星硬X射线数据的时序分析。
英文摘要：
Hard xray data from the RXTE observatory (HEXTE energy range 15 to 240 keV) have been analyzed to obtain a phase coherent timing solution for the Crab pulsar glitch of 15 July 2000. The results are: (1) step change in the rotation frequency $ν_0$ of the Crab pulsar at the epoch of the glitch is $Δν_0 = (30 \pm 3) \times 10^{-9} \times ν_0$, (2) step change in its time derivative is $Δ\dot ν_0 = (4.8 \pm 0.6) \times 10^{-3} \times \dot ν_0$, and (3) the time scale of decay of the the step change is $τ_d = 4.7 \pm 0.5$ days. The first two results are consistent with those obtained at radio frequencies by the Jodrell Bank observatory. The last result has not been quoted in the literature, but could be an underestimate due to lack of observations very close to the glitch epoch. By comparing with the monthly timing ephemeris published by the Jodrell group for the Crab pulsar, the time delay between the main peaks of the hard xray and radio pulse profiles is estimated to be $+411 \pm 167$ $μ$sec. Although this number is not very significant, it is consistent with the number derived for the 2 to 16 keV energy range, using the PCA instrument of RXTE. The separation between the two peaks of the integrated pulse profile of the Crab pulsar, and the ratio of their intensities, both are statistically similar before and after the glitch. The dead time corrected integrated photon flux within the integrated pulse profile appears to decrease after the glitch, although this is not a statistically strong result. This work achieves what can be considered to be almost absolute timing analysis of the Crab pulsar hard xray data.
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