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arXiv 1501.03225astro-ph.HE
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PSR J1741-2054自行和脉冲星风星云的X射线分析

X-ray analysis of the proper motion and pulsar wind nebula for PSR J1741-2054

Katie Auchettl, Patrick Slane, Roger W. Romani, Bettina Posselt, George G. Pavlov, Oleg Kargaltsev, C-Y Ng, Tea Temim, Martin. C. Weisskopf, Andrei Bykov, Douglas A. Swartz

摘要:

我们使用$Chandra$ ACIS-S探测器获得了PSR J1741-2054的6个观测值,总计$\sim$ 300 ks。通过将这一新时期的观测记录到3.2年前在视场中使用X射线点源进行的存档观测,我们测量了$μ=109 \pm 10 {\rm mas\ yr}^{-1}$的脉冲星自行,其方向与观测到的H $α$星云的对称轴一致。我们调查了脉冲星的推断过去的轨迹,但没有发现令人信服的关联与OB协会的祖先可能起源。我们确认以前测量的脉冲星光谱作为一个吸收功率定律与光子指数$Γ$ =2.68 $\pm$ 0.04,加上一个黑体的发射半径为(4.5 $^{+3.2}_{-2.5})d_{0.38}$公里,DM估计的距离为$0.38d_{0.38}$千秒差距和温度为$61.7\pm3.0$ eV。来自致密星云的辐射可以用吸收幂律模型来描述,光子指数为$Γ$ = 1.67 $\pm$ 0.06,而扩散辐射被看作是脉冲星东北方向延伸的尾迹,没有同步辐射冷却的证据。我们还应用图像反卷积技术来搜索脉冲星附近的小尺度结构,但没有发现这种结构的确凿证据。

英文摘要:

We obtained six observations of PSR J1741-2054 using the $Chandra$ ACIS-S detector totaling $\sim$300 ks. By registering this new epoch of observations to an archival observation taken 3.2 years earlier using X-ray point sources in the field of view, we have measured the pulsar proper motion at $μ=109 \pm 10 {\rm mas\ yr}^{-1}$ in a direction consistent with the symmetry axis of the observed H$α$ nebula. We investigated the inferred past trajectory of the pulsar but find no compelling association with OB associations in which the progenitor may have originated. We confirm previous measurements of the pulsar spectrum as an absorbed power law with photon index $Γ$=2.68$\pm$0.04, plus a blackbody with an emission radius of (4.5$^{+3.2}_{-2.5})d_{0.38}$ km, for a DM-estimated distance of $0.38d_{0.38}$ kpc and a temperature of $61.7\pm3.0$ eV. Emission from the compact nebula is well described by an absorbed power law model with a photon index of $Γ$ = 1.67$\pm$0.06, while the diffuse emission seen as a trail extending northeast of the pulsar shows no evidence of synchrotron cooling. We also applied image deconvolution techniques to search for small-scale structures in the immediate vicinity of the pulsar, but found no conclusive evidence for such structures.

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。

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