arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 0911.2618astro-ph.HE
收藏

用INTEGRAL/SPI望远镜对蟹状星云脉冲星的绝对计时

Absolute timing of the Crab pulsar with the INTEGRAL/SPI telescope

S. Molkov, E. Jourdain, J. P. Roques

摘要:

本文研究了蟹状星云脉冲星辐射在电磁波谱硬X射线区的脉冲形状演化。特别地,我们研究了蟹状星云脉冲星相位剖面在硬X射线和其他波段测量的对齐。为了获得硬X射线脉冲轮廓,我们使用了6年(2003-2009年,总曝光量约为4毫秒)的公开可用的数据的SPI望远镜板上的INTEGRAL天文台,折叠的脉冲星时间的解决方案来自Jodrell银行蟹脉冲星月历。我们发现硬X射线20-100 keV能带的主脉冲在相位上领先射电脉冲$8.18\pm0.46$毫周期,或在时间上领先$275\pm15 μs$。所引用的误差仅代表统计不确定性,我们的系统误差估计为$\sim 40 μs$,主要由无线电测量不确定性引起。在硬X射线中,相平面上主脉冲和脉冲间的平均距离为$0.3989\pm0.0009$。为了比较我们在硬X射线与软2-20 keV X射线波段的研究结果,我们使用了准同步蟹状星云观测数据,并使用了Rossi X射线定时探测器(RXTE)任务上的PCA监视器。在3-20 keV频带中测量的时滞和脉冲间隔值分别是周期的$0.00933\pm0.00016$(对应于$310\pm6 μs$)和$0.40016\pm0.00028$部分。虽然在软X射线和硬X射线中测量的脉冲间隔值一致,但时间滞后在统计上不同。另外的分析表明,无线电和X射线信号之间的延迟随2 - 300 keV能量范围内的能量而变化。我们解释这样的行为,由于两个独立的组件负责在这个能量带的螃蟹脉冲发射的叠加。

英文摘要:

We have investigated the pulse shape evolution of the Crab pulsar emission in the hard X-ray domain of the electromagnetic spectrum. In particular, we have studied the alignment of the Crab pulsar phase profiles measured in the hard X-rays and in other wavebands. To obtain the hard X-ray pulse profiles, we have used six year (2003-2009, with a total exposure of about 4 Ms) of publicly available data of the SPI telescope on-board of the INTEGRAL observatory, folded with the pulsar time solution derived from the Jodrell Bank Crab Pulsar Monthly Ephemeris. We found that the main pulse in the hard X-ray 20-100 keV energy band is leading the radio one by $8.18\pm0.46$ milliperiods in phase, or $275\pm15 μs$ in time. Quoted errors represent only statistical uncertainties.Our systematic error is estimated to be $\sim 40 μs$ and is mainly caused by the radio measurement uncertainties. In hard X-rays, the average distance between the main pulse and interpulse on the phase plane is $0.3989\pm0.0009$. To compare our findings in hard X-rays with the soft 2-20 keV X-ray band, we have used data of quasi-simultaneous Crab observations with the PCA monitor on-board the Rossi X-Ray Timing Explorer (RXTE) mission. The time lag and the pulses separation values measured in the 3-20 keV band are $0.00933\pm0.00016$ (corresponding to $310\pm6 μs$) and $0.40016\pm0.00028$ parts of the cycle, respectively. While the pulse separation values measured in soft X-rays and hard X-rays agree, the time lags are statistically different. Additional analysis show that the delay between the radio and X-ray signals varies with energy in the 2 - 300 keV energy range. We explain such a behaviour as due to the superposition of two independent components responsible for the Crab pulsed emission in this energy band.

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。

↑