arXiv 1605.081382016-05-26hep-phastro-ph.HE

$e^{\pm}$湮灭自相互作用暗物质诱导$γ-$射线发射的形态

On the morphology of $γ-$ray emission induced by $e^{\pm}$ from annihilating self-interacting dark matter

Ming-Yang Cui, Cun Zhang, Hong-Shi Zong

备注：: 9 pages, 6 figures, Phys. Rev. D in press
发表信息：: Phys. Rev. D 93, 123516 (2016)
DOI：: 10.1103/PhysRevD.93.123516

摘要：

利用费米-LAT数据，相当多的研究小组报告了银河系中心（GC）周围空间扩展的GeV $γ$射线过剩。这种GeV过量的物理起源仍然不清楚，一个有趣的可能性是自相互作用暗物质（SIDM）粒子与星际光子湮灭产生的电子/正电子的逆康普顿散射。在这项工作中，我们计算这样一种$γ$射线发射的形态。对于$\barχχ\rightarrow ϕϕ\rightarrow e^{+}e^{-}e^{+}e^{-}$的湮灭通道，逆康普顿散射（ICS）在产生GeV $γ$射线发射上占主导地位。对于静止质量为$m_χ\sim $几十GeV的SIDM粒子，可能有利于银河系GeV过剩的建模，在GeV能量的ICS辐射集中沿银河系平面。在某些感兴趣的区域发现了高达$\geq 0.3$的不对称度，这反过来又提出了一个合理的测试SIDM解释的GeV过剩。

英文摘要：

With the Fermi-LAT data quite a few research groups have reported a spatially extended GeV $γ$-ray excess surrounding the Galactic Center (GC). The physical origin of such a GeV excess is still unclear and one interesting possibility is the inverse Compton scattering of the electrons/positrons from annihilation of self-interacting dark matter (SIDM) particles with the interstellar optical photons. In this work we calculate the morphology of such a kind of $γ$-ray emission. For the annihilation channel of $\barχχ\rightarrow ϕϕ\rightarrow e^{+}e^{-}e^{+}e^{-}$, the inverse Compton scattering (ICS) dominates over the bremsstrahlung on producing the GeV $γ$-ray emission. For the SIDM particles with a rest mass $m_χ\sim $ tens GeV that may be favored by the modeling of the Galactic GeV excess, the ICS radiation at GeV energies concentrates along the Galactic plane. The degrees of asymmetry high up to $\geq 0.3$ are found in some regions of interest, which in turn proposes a plausible test on the SIDM interpretation of the GeV excess.

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