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arXiv 1707.08473astro-ph.HE
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银河系中心的硬Cosmic Ray海:对H.E.S.S.的一致解释和费米LAT $γ$射线数据

Hard Cosmic Ray Sea in the Galactic Center: a consistent interpretation of H.E.S.S. and Fermi-LAT $γ$-ray data

D. Gaggero, D. Grasso, A. Marinelli, M. Taoso, A. Urbano, S. Ventura

摘要:

我们提出了一个新的解释的伽玛射线扩散发射测量的H.E.S.S.在银河系中心(GC)区域和银河系脊。我们的起始基础是PASS 8费米-LAT数据的更新分析,它允许将H.E.S.S.测量的光谱扩展到几个GeV。并推断出100 GeV以上的初级CR径向分布。我们将这些结果与CR运输模型进行比较,假设在银河系内部具有刚性的扩散系数更难缩放。这样的行为再现的径向依赖的CR光谱指数最近推断从费米-LAT测量内GP。我们发现,在这种情况下,大部分的银河山脊发射可以自然地解释的相互作用的扩散,稳定状态的银河CR海相互作用的气体存在于中央分子区。GC PeVatron的证据明显弱于采用传统(较软)CR海推断的证据。

英文摘要:

We present a novel interpretation of the gamma-ray diffuse emission measured by H.E.S.S. in the Galactic Center (GC) region and the Galactic ridge. Our starting base is an updated analysis of PASS8 Fermi-LAT data, which allows to extend down to few GeV the spectra measured by H.E.S.S. and to infer the primary CR radial distribution above 100 GeV. We compare those results with a CR transport model assuming a harder scaling of the diffusion coefficient with rigidity in the inner Galaxy. Such a behavior reproduces the radial dependence of the CR spectral index recently inferred from Fermi-LAT measurements in the inner GP. We find that, in this scenario, the bulk of the Galactic ridge emission can be naturally explained by the interaction of the diffuse, steady-state Galactic CR sea interacting with the gas present in the Central molecular zone. The evidence of a GC PeVatron is significantly weaker than that inferred adopting a conventional (softer) CR sea.

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