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arXiv 1307.6571astro-ph.HE
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第一个费米LAT星表:对Cosmic Ray贡献的约束

The 1st Fermi LAT SNR Catalog: Constraining the Cosmic Ray Contribution

T. J. Brandt, F. Acero, F. de Palma, J. W. Hewitt, M. Renaud

摘要:

尽管有诱人的证据表明超新星遗迹(SNRs)是银河系宇宙射线(CR)的来源,包括最近探测到两个SNRs的强子伽马射线发射的光谱特征,但它们的起源仍然难以捉摸。我们解决了长期存在的问题银河CR核的起源,使用我们的统计学显着的GeV SNR样本估计直接观察到的CR的SNR的贡献。CR和周围的气体之间的相互作用附近的SNR发射光子通过π衰变在GeV的能量,提供了一个原位示踪剂CR,否则直接测量气球和卫星实验在地球附近。到目前为止,费米LAT SNR目录已经检测到50多个SNR和具有各种属性的潜在关联,但所有这些都仍然是可能的加速器。我们调查的GeV和多波长(MW)的SNRs的发射,以限制其最大的贡献,观察银河系CR。我们的工作表明,需要改进以前足够的简单模型描述这些对象的GeV和MW的排放。

英文摘要:

Despite tantalizing evidence that supernova remnants (SNRs) are the source of Galactic cosmic rays (CRs), including the recent detection of a spectral signature of hadronic gamma-ray emission from two SNRs, their origin in aggregate remains elusive. We address the long-standing question of Galactic CR nuclei origins using our statistically significant GeV SNR sample to estimate the contribution of SNRs to directly observed CRs. Interactions between CRs and ambient gas near the SNRs emit photons via pion decay at GeV energies, providing an in situ tracer for CRs otherwise measured directly with balloon-borne and satellite experiments near the Earth. To date, the Fermi LAT SNR Catalog has detected more than 50 SNRs and potential associations in classes with a variety of properties, yet all remain possible accelerators. We investigate the GeV and multiwavelength (MW) emission from SNRs to constrain their maximal contribution to observed Galactic CRs. Our work demonstrates the need for improvements to previously sufficient simple models describing the GeV and MW emission from these objects.

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