TeV halos and the role of pulsar wind nebulae as sources of cosmic-ray positrons
TeV halos and the role of pulsar wind nebulae as sources of cosmic-ray positrons
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DOI：
10.1103/physrevd.107.123020
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发表时间：
2023-05
影响因子：
5
通讯作者：
Benedikt Schroer;Carmelo Evoli;P. Blasi
中科院分区：
文献类型：
--
作者：
Benedikt Schroer;Carmelo Evoli;P. Blasi
最近的探测Geminga PWN HAWC在多TeV波段，使我们能够推断宝贵的信息对运输的脉冲星的周围环境和光谱的对贡献的Geminga类脉冲星的宇宙辐射的光谱对。此外，这种检测使我们能够解决与PWNe相关的所谓TeV晕有多典型的问题。我们的计算证实了需要在脉冲星周围至少20 - 50\，$pc的区域内抑制扩散，并在这里用于推断在终止激波处加速的对的光谱上的宝贵约束：更具体地说，我们讨论了这样的光谱与PWN中通常预期的光谱一致的条件，以及一旦它逃离晕，它是如何被修改的。最后，我们讨论了在脉冲星环境中的质子加速，一个主题的深刻相关的整个领域的粒子加速和物理学的Geminga周围的TeV晕的存在的影响。
The recent detection of the Geminga PWN by HAWC in the multi-TeV band allows us to infer precious information about the transport of pairs in the immediate surroundings of the pulsar and on the spectrum of pairs contributed by a Geminga-like pulsar to the spectrum of pairs in the cosmic radiation. Moreover, this detection allows us to address the issue of how typical are the so-called TeV halos associated to PWNe. Our calculations confirm the need to have suppressed diffusion in a region of at least $20-50\,$pc around the pulsar, and are used here to infer precious constraints on the spectrum of pairs accelerated at the termination shock: more specifically, we discuss the conditions under which such a spectrum is consistent with that typically expected in a PWN and how it gets modified once it escapes the halo. Finally, we discuss the implications of the existence of a TeV halo around Geminga in terms of acceleration of protons in the pulsar environment, a topic of profound relevance for the whole field of particle acceleration and physics of pulsars.