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arXiv 0910.2652astro-ph.HE
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与Gamma-ray源HESS $ $ J1640-465有关的脉冲星风星云的高分辨率X射线观测

High Resolution X-ray Observations of the Pulsar Wind Nebula Associated with the Gamma-ray Source HESS$ $J1640-465

A. Lemiere, P. Slane, B. M. Gaensler, S. Murray

摘要:

我们对极高能$γ$射线源HESS $ $ J1640-465进行了钱德拉X射线观测。我们确定了一个点源周围的扩散发射,填充了扩展对象先前检测到的XMM牛顿在HESS源的质心,在壳的射电超新星遗迹(SNR)G338.3-0.0。漫发射的形态非常类似于脉冲星风星云(PWN),并不对称地延伸到作为潜在脉冲星的点源的西南部。假定的脉冲星和致密星云的光谱可以很好地用吸收幂律模型来表征,对于合理的$N_{\rm H}$值$14\times 10^{22} \rm cm^{-2}$,该模型分别表现出1.1和2.5的指数,这是典型的船帆座类PWNe。我们表明,鉴于H $ $ I沿视线观察到的吸收功能,SNR和H $ $ II周围区域可能是连接的,位于8千秒差距和13千秒差距之间。该系统的年龄在10到30 kyr之间。对于10 kpc的距离(也与X射线吸收一致),假定的脉冲星和星云的2-10 keV X射线光度是$L_{\rm PSR} \sim 1.3 \times 10^{33} d_{10 \rm kpc}^{2} \rm erg.s^{-1}$和$L_{\rm PWN} \sim 3.9 \times 10^{33} d_{10}^{2} \rm erg.s^{-1}$($d_{10} = d / 10{\rm kpc}$)。$L_{\rm PWN}/L_{\rm PSR} \sim 3.4$的通量比和系统的总光度都预示了在$\dot{E} \sim 4 \times 10^{36} \rm erg s^{-1}$附近存在一个脉冲星自旋下降功率。最后,我们考虑几个原因观察到的PWN形态的不对称性,并讨论了潜在的关联与HESS源的时间依赖的一区轻子模型。

英文摘要:

We present a Chandra X-ray observation of the very high energy $γ$-ray source HESS$ $J1640-465. We identify a point source surrounded by a diffuse emission that fills the extended object previously detected by XMM Newton at the centroid of the HESS source, within the shell of the radio supernova remnant (SNR) G338.3-0.0. The morphology of the diffuse emission strongly resembles that of a pulsar wind nebula (PWN) and extends asymmetrically to the South-West of a point-source presented as a potential pulsar. The spectrum of the putative pulsar and compact nebula are well-characterized by an absorbed power-law model which, for a reasonable $N_{\rm H}$ value of $14\times 10^{22} \rm cm^{-2}$, exhibit an index of 1.1 and 2.5 respectively, typical of Vela-like PWNe. We demonstrate that, given the H$ $I absorption features observed along the line of sight, the SNR and the H$ $II surrounding region are probably connected and lie between 8 kpc and 13 kpc. The resulting age of the system is between 10 and 30 kyr. For a 10 kpc distance (also consistent with the X-ray absorption) the 2-10 keV X-ray luminosities of the putative pulsar and nebula are $L_{\rm PSR} \sim 1.3 \times 10^{33} d_{10 \rm kpc}^{2} \rm erg.s^{-1}$ and $L_{\rm PWN} \sim 3.9 \times 10^{33} d_{10}^{2} \rm erg.s^{-1}$ ($d_{10} = d / 10{\rm kpc}$). Both the flux ratio of $L_{\rm PWN}/L_{\rm PSR} \sim 3.4$ and the total luminosity of this system predict a pulsar spin-down power around $\dot{E} \sim 4 \times 10^{36} \rm erg s^{-1}$. We finally consider several reasons for the asymmetries observed in the PWN morphology and discuss the potential association with the HESS source in term of a time-dependent one-zone leptonic model.

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