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arXiv 2110.09412astro-ph.HE
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脉冲星的超高能辐射

Very-High-Energy Emission From Pulsars

Alice K. Harding, Christo Venter, Constantinos Kalapotharakos

摘要:

空气切伦科夫望远镜已经从越来越多的费米双星中探测到能量超过50 GeV的脉动。其中包括Crab、Vela、PSR B1706-44和Geminga,前两颗的脉冲探测能量超过1 TeV。在某些情况下,似乎有甚高能量(VHE)发射,这是费米光谱向高能量的延伸,而在其他情况下,可能存在需要单独发射机制的额外高能光谱成分。我们提出的宽带光谱建模的结果,使用全球磁层场和多种发射机制,包括同步曲率(SC)和逆康普顿散射(ICS)辐射加速粒子(原色)和同步加速器自康普顿(SSC)发射从较低的能量对。我们的模型预测三个不同的VHE组件:SC从初级的高能量尾巴可以扩展到100 GeV,SSC从对,可以扩展到几个TeV和ICS从初级粒子加速在当前片,散射对同步辐射,出现超过10 TeV。我们的模型显示高能量综合征- II和MAGIC探测到了主要SC成分的高能尾部,该成分在船帆座、Geminga和PSR B1706-44中产生费米光谱。我们认为H.E.S.S. S已经看到了来自船帆座的峰值超过10 TeV的ICS分量。利用HAWC和CTA可以探测到蟹状星云和其他类星体的这种发射成分,并直接测量类星体中的最大粒子能量。

英文摘要:

Air-Cherenkov telescopes have detected pulsations at energies above 50 GeV from a growing number of Fermi pulsars. These include the Crab, Vela, PSR B1706-44 and Geminga, with the first two having pulsed detections above 1 TeV. In some cases, there appears to be very-high-energy (VHE) emission that is an extension of the Fermi spectra to high energies, while in other cases, additional higher-energy spectral components that require a separate emission mechanism may be present. We present results of broad-band spectral modeling using global magnetosphere fields and multiple emission mechanisms that include synchro-curvature (SC) and inverse Compton scattered (ICS) radiation from accelerated particles (primaries) and synchrotron-self Compton (SSC) emission from lower-energy pairs. Our models predict three distinct VHE components: SC from primaries whose high-energy tail can extend to 100 GeV, SSC from pairs that can extend to several TeV and ICS from primary particles accelerated in the current sheet, scattering pair synchrotron radiation, that appears beyond 10 TeV. Our models suggest that H.E.S.S.-II and MAGIC have detected the high-energy tail of the primary SC component that produces the Fermi spectrum in Vela, Geminga and PSR B1706-44. We argue that the ICS component peaking above 10 TeV from Vela has been seen by H.E.S.S. Detection of this emission component from the Crab and other pulsars is possible with HAWC and CTA, and directly measures the maximum particle energy in pulsars.

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