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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >A NuSTAR study of the 55 ks hard X-ray pulse-phase modulation in the magnetar 4U 0142+61
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A NuSTAR study of the 55 ks hard X-ray pulse-phase modulation in the magnetar 4U 0142+61

机译:在磁场4U 0142 + 61中的55 ks硬X射线脉冲相调制的NUSTAR研究

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Archival NuSTAR data of the magnetar 4U 0142+61, acquired in 2014 March for a total time span of 258 ks, were analyzed. This is to reconfirm the 55 ks modulation in the hard X-ray pulse phases of this source, found with a Suzaku observation in 2009 (Makishima et al., 2014, Phys. Rev. Lett., 112, 171102). Indeed, the 10-70 keV X-ray pulsation, detected with NuSTAR at 8.68917 s, was found to be also phase-modulated (at >98% confidence) at the same similar to 55 ks period, or half that value. Furthermore, a brief analysis of another Suzaku data set of 4U 0142+61, acquired in 2013, reconfirmed the same similar to 55 ks phase modulation in the 15-40 keV pulses. Thus, the hard X-ray pulse-phase modulation was detected with Suzaku (in 2009 and 2013) and NuSTAR (in 2014) at a consistent period. However, the modulation amplitude varied significantly; A similar to 0.7 s with Suzaku (in 2009), A similar to 1.2 s with Suzaku (in 2013), and A similar to 0.17 s with NuSTAR. In addition, the phase modulation properties detected with NuSTAR differed considerably between the first 1/3 and the latter 2/3 of the observation. In energies below 10 keV, the pulse-phase modulation was not detected with either Suzaku or NuSTAR. These results reinforce the view of Makishima et al. (2014, Phys. Rev. Lett., 112, 171102); the neutron star in 4U 0142+61 keeps free precession, under a slight axial deformation due probably to ultra-high toroidal magnetic fields of similar to 10(16)G. The wobbling angle of precession should remain constant, but the pulse-phase modulation amplitude varies on time scales of months to years, presumably as asymmetry of the hard X-ray emission pattern around the star's axis changes.
机译:分析了2014年3月在2014年3月的磁场4U 0142 + 61的档案NUSTAR数据,总时间跨度为258 ks。这是重新确认在该来源的硬X射线脉冲阶段中的55 ks调制,在2009年发现了苏崎观察(Makishima等,2014年,Phys。Rev. Lett。,112,171102)。实际上,用NUSTAR的10-70keV X射线脉动在8.68917 S中发现也是相同的(at> 98%置信度),与55 ks期间或一半的值相同。此外,在2013年获得的4U 0142 + 61的另一个Suzaku数据集的简要分析,在15-40keV脉冲中重新确认了与55ks相位调制相同的相同。因此,用舒萨库(2009和2013年)和Nustar(2014年)检测到硬X射线脉冲相调试在一致的时期。但是,调制幅度显着变化;与苏崎(2009年)类似于0.7秒,与苏崎(2013年)类似于1.2秒,与玉米菌相似的0.17秒。另外,在观察的前1/3和后一2/3之间,用Nustar检测的相位调制特性不同。在低于10keV的能量中,没有用舒萨库或尼斯塔尔检测脉冲相位调制。这些结果强化了Makishima等人的观点。 (2014年,Phys.Rev. Lett。,112,171102); 4U 0142 + 61中的中子星保持自由进料,在略微的轴向变形下,由于超高环形磁场,类似于10(16)克。摇晃的进介角应保持恒定,但脉冲相调制幅度在几个月到几年的时间范围内变化,可能是星轴周围的硬X射线发射图案的不对称性。

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