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arXiv 0908.4266astro-ph.HE
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扩散中微子极限对河外点源通量的约束

Constraints on Extragalactic Point Source Flux from Diffuse Neutrino Limits

Andrea Silvestri, Steven W. Barwick

摘要:

我们用漫射中微子通量极限来约束河外中微子点源的最大通量。我们证明了河外点源的最大通量为E^2(dN/dE)< 1.4 x 10^-9(L_nu/2x10^43 erg/s)^1/3 GeV cm-^2 s^-1,其中单个点源具有每十年的平均中微子光度L_nu。它只与局部宇宙中的不均匀物质密度分布、光度分布和假定的光谱指数等因素有轻微的关系。导出的约束是至少一个数量级低于当前的实验限制从直接搜索。重要的限制也来自中微子源的数量密度和总中微子功率密度。

英文摘要:

We constrain the maximum flux from extragalactic neutrino point sources by using diffuse neutrino flux limits. We show that the maximum flux from extragalactic point sources is E^2(dN/dE) < 1.4 x 10^-9 (L_nu/2x10^43 erg/s)^1/3 GeV cm-^2 s^-1 from individual point sources with average neutrino luminosity per decade, L_nu. It depends only slightly on factors such as the inhomogeneous matter density distribution in the local universe, the luminosity distribution, and the assumed spectral index. The derived constraints are at least one order of magnitude below the current experimental limits from direct searches. Significant constraints are also derived on the number density of neutrino sources and on the total neutrino power density.

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