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arXiv 1507.06129astro-ph.HEhep-ph
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对gamma-ray银河系中心过剩的现实的天体物理学解释

Towards a realistic astrophysical interpretation of the gamma-ray Galactic center excess

Daniele Gaggero, Marco Taoso, Alfredo Urbano, Mauro Valli, Piero Ullio

摘要:

最近在费米-LAT数据中发现了银河系中心区域的球形对称伽马射线辐射,最初与暗物质粒子湮灭有关。在银河系内部kpc的高气体密度与一个非常大的超新星速率相关的证据的指导下,因此与正在进行的宇宙射线加速,我们调查,而不是在普通的宇宙射线源和标准的稳态扩散来解决这个过剩的可能性。我们改变源项,并始终相关的伽马射线发射,在模板拟合分析的上下文中。我们专注于一个感兴趣的区域(ROI)定义为:$|l|<20^{\circ}; \hspace{5mm} 2^{\circ}<|b|<20^{\circ},$与$l$和$b$银河系的经度和纬度坐标。我们详细分析了我们的框架的整体适合度,并对不同方向的数据检查配置文件进行了详细的直接比较。值得注意的是,与我们的场景相关的拟合检验统计量与这里考虑的ROI中的暗物质一样好。

英文摘要:

A spherical-symmetric gamma-ray emission from the central region of the Galaxy has been recently identified in Fermi-LAT data, and initially associated to dark matter particle annihilations. Guided by the evidence for a high gas density in the inner kpc of the Galaxy correlated with a very large Supernova rate, and hence with ongoing cosmic-ray acceleration, we investigate instead the possibility of addressing this excess in terms of ordinary cosmic-ray sources and standard steady-state diffusion. We alter the source term, and consistently the correlated gamma-ray emissions, in the context of a template-fitting analysis. We focus on a region of interest (ROI) defined as: $|l|<20^{\circ}; \hspace{5mm} 2^{\circ}<|b|<20^{\circ},$ with $l$ and $b$ the Galactic longitude and latitude coordinates. We analyze in detail the overall goodness of the fit of our framework, and perform a detailed direct comparison against data examining profiles in different directions. Remarkably, the test statistic of the fit related to our scenario turns out to be as good as the Dark Matter one in the ROI here considered.

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