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arXiv 1802.03520astro-ph.HE
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HESS J1640-465 --一个发射脉冲星风星云的Gamma-ray?

HESS J1640-465 -- a Gamma-ray emitting pulsar wind nebula ?

Yu-Liang Xin, Neng-Hui Liao, Xiao-Lei Guo, Qiang Yuan, Si-Ming Liu, Yi-Zhong Fan, Da-Ming Wei

摘要:

HESS J1640-465是一个扩展的TeV $γ$射线源,其$γ$射线发射是否来自超新星遗迹(SNR)或脉冲星风星云(PWN)的壳层仍存在争议。利用费米大天区望远镜记录的8年Pass 8数据,重新分析了HESS J1640-465场中的GeV $γ$射线数据。发现了一个与HESS J 1640 -465位置一致的扩展GeV $γ$射线源,其光子谱在10-500 GeV能量范围内可用指数为$1.42\pm0.19$的幂律描述,并与HESS J 1640 -465的TeV谱平滑连接。HESS J1640-465的宽带谱可以很好地用一个轻子模型来拟合,该模型具有一个在$\sim$ 300 TeV处指数截止的破幂律电子谱。HESS J1640-465的光谱特性与其他被确认为PWNe的源的特征大致一致,例如高能光度比与脉冲星物理参数(包括自旋下光度$\dot{E}$和特征年龄$τ_c$)之间的相关性。所有这些证据都支持HESS J1640-465的$γ$射线发射可能源自PSR J1640-4631供电的PWN,而不是SNR G338.3-0.0的外壳。

英文摘要:

HESS J1640-465 is an extended TeV $γ$-ray source and its $γ$-ray emission whether from the shell of a supernova remnant (SNR) or a pulsar wind nebula (PWN) is still under debate. We reanalyze the GeV $γ$-ray data in the field of HESS J1640-465 using eight years of Pass 8 data recorded by the Fermi Large Area Telescope. An extended GeV $γ$-ray source positionally coincident with HESS J1640-465 is found. Its photon spectrum can be described by a power-law with an index of $1.42\pm0.19$ in the energy range of 10-500 GeV, and smoothly connects with the TeV spectrum of HESS J1640-465. The broadband spectrum of HESS J1640-465 can be well fit by a leptonic model with a broken power-law spectrum of electrons with an exponential cut-off at $\sim$ 300 TeV. The spectral properties of HESS J1640-465 are broadly consistent with the characteristics of other sources identified as PWNe, such as the correlations between high-energy luminosity ratios and the physical parameters of pulsar, including spin-down luminosity $\dot{E}$ and characteristic age $τ_c$. All these pieces of evidence support that the $γ$-ray emission of HESS J1640-465 may originate from the PWN powered by PSR J1640-4631 rather than the shell of the SNR G338.3-0.0.

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