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arXiv 1804.03325astro-ph.HE
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HESS J1809-193和HESS J1813-178区域中的GeV发射:HESS J1809-193是质子pevatron吗?

GeV emission in the region of HESS J1809-193 and HESS J1813-178: is HESS J1809-193 a proton pevatron?

Miguel Araya

摘要:

HESS J1809-193是高能立体观测系统发现的一个未确认的TeV源,最初被归类为与脉冲星PSR J1809-1917相关的脉冲星风星云(PWN)候选者。然而,最近对深层射电观测和源附近的星际介质的研究发现了伽马射线强子方案的证据。在这里,详细研究的GeV的排放在该地区使用的数据从\emph{Fermi} LAT。GeV发射在TeV发射的区域中具有扩展的形态,并且整体光谱可以由具有简单的幂律谱的宇宙射线群来解释,其中能量扩展到1 PeV。然而,数十TeV的光谱应该在未来更深入地观察,以确认其强子性质,并且不能排除该地区几个已知超新星遗迹的轻子和强子发射组合的其他情况。附近的TeV源HESS J1813-178,被认为是一个PWN,也详细研究了在GeV的能量,我们发现了一个区域的显着的发射比TeV的发射,其光谱是软比预期的PWN,但类似于在几个恒星形成的地区,被认为是加速质子。在X射线PWN的位置处,除了扩展发射之外,还有GeV点源的边缘证据。

英文摘要:

HESS J1809-193 is an unidentified TeV source discovered by the High Energy Stereoscopic System and originally classified as a pulsar wind nebula (PWN) candidate associated with the pulsar PSR J1809-1917. However, a recent study of deep radio observations and the interstellar medium near the source has found evidence for a hadronic scenario for the gamma-rays. Here, a detailed study of the GeV emission in the region using data from the \emph{Fermi} LAT is presented. The GeV emission has an extended morphology in the region of the TeV emission and the overall spectrum can be accounted for by a cosmic ray population having a simple power-law spectrum with energies extending up to 1 PeV. However, the spectrum at tens of TeV should be observed more deeply in the future to confirm its hadronic nature, and other scenarios involving combinations of leptonic and hadronic emission from several of the known supernova remnants in the region cannot be ruled out. The nearby TeV source HESS J1813-178, thought to be a PWN, is also studied in detail at GeV energies and we find a region of significant emission which is much more extended than the TeV emission and whose spectrum is softer than expected from a PWN but similar to those seen in several star forming regions that are believed to accelerate protons. There is marginal evidence for a GeV point source at the location of the X-ray PWN, beside the extended emission.

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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