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arXiv 1702.01124astro-ph.HEhep-ph
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在银河系中心闪耀的弥散宇宙射线:对H.E.S.S.的新解释和费米-LAT gamma-ray数据

Diffuse cosmic rays shining in the Galactic center: A novel interpretation of H.E.S.S. and Fermi-LAT gamma-ray data

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

摘要:

我们提出了一个新的解释的$γ$射线的扩散发射测量费米-LAT和H.E.S.S.银河系中心(GC)和银河系脊(GR)。在第一部分中,我们基于PASS 8 Fermi-LAT数据进行了数据驱动分析:我们将H.E.S.S.并推断出0.1 ~ 3 TeV的初级宇宙线径向分布。在第二部分中,我们采用了基于位置相关扩散系数的CR输运模型。这种行为再现了最近从费米-LAT观测中推断出的CR光谱指数的径向依赖性。我们发现,大部分的GR发射可以自然地解释的扩散稳定状态的银河CR海与气体存在于中央分子区的相互作用。虽然我们的研究结果留下了与中心源相关的剩余径向依赖发射的空间,但大规模背景的相关性阻止了GC Pevatron的确凿证据。

英文摘要:

We present a novel interpretation of the $γ$-ray diffuse emission measured by Fermi-LAT and H.E.S.S. in the Galactic center (GC) region and the Galactic ridge (GR). In the first part we perform a data-driven analysis based on PASS8 Fermi-LAT data: we extend down to few GeV the spectra measured by H.E.S.S. and infer the primary cosmic-ray (CR) radial distribution between 0.1 and 3 TeV. In the second part we adopt a CR transport model based on a position-dependent diffusion coefficient. Such behavior reproduces the radial dependence of the CR spectral index recently inferred from the Fermi-LAT observations. We find that the bulk of the GR emission can be naturally explained by the interaction of the diffuse steady-state Galactic CR sea with the gas present in the Central Molecular Zone. Although our results leave room for a residual radial-dependent emission associated with a central source, the relevance of the large-scale background prevents from a solid evidence of a GC Pevatron.

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