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arXiv 1208.5488astro-ph.COastro-ph.GAastro-ph.HEhep-ph
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银河系中心射电对暗物质湮灭的Gamma-Ray谱线的约束

Galactic Center Radio Constraints on Gamma-Ray Lines from Dark Matter Annihilation

Ranjan Laha, Kenny Chun Yu Ng, Basudeb Dasgupta, Shunsaku Horiuchi

摘要:

最近在银河系中心的费米-LAT数据中发现了一条或多条130 GeV的伽马射线线,这被解释为暗物质湮灭到Zγ或Hγ的暗示,湮灭截面<σv>约为10^{-27} cm ^3 s^{-1}。我们测试这一假设,通过比较同步辐射通量,由于电子和正电子的衰变的Z或H玻色子只在银河系中心对来自同一地区的银河系中心的无线电数据。我们发现,从单碟望远镜的无线电数据轻微限制这种解释的声称伽马线的合同NFW配置文件。已经运行的射电望远镜,如LWA、VLA-Low和LOFAR,以及未来的射电望远镜,如SKA,它们对小至10^{-28} cm ^3 s^{-1}的湮灭截面敏感,可以很快证实或排除这种情况。我们讨论了暗物质的配置文件,磁场,和背景辐射密度分布的假设,并表明,任何合理的假设的约束是相对稳健的。独立于上述最近的发展,我们强调,我们的射电约束适用于所有的模型,其中暗物质湮灭到Zγ或Hγ。

英文摘要:

Recent evidence for one or more gamma-ray lines at ~ 130 GeV in the Fermi-LAT data from the Galactic Center has been interpreted as a hint for dark matter annihilation to Zγ or Hγ with an annihilation cross section, <σv> ~ 10^{-27} cm^3 s^{-1} . We test this hypothesis by comparing synchrotron fluxes due to the electrons and positrons from the decay of the Z or the H boson only in the Galactic Center against radio data from the same region in the Galactic Center. We find that the radio data from single dish telescopes marginally constrain this interpretation of the claimed gamma lines for a contracted NFW profile. Already-operational radio telescopes such as LWA, VLA-Low and LOFAR, and future radio telescopes like SKA, which are sensitive to annihilation cross sections as small as 10^{-28} cm^3 s^{-1}, can confirm or rule out this scenario very soon. We discuss the assumptions on the dark matter profile, magnetic fields, and background radiation density profiles, and show that the constraints are relatively robust for any reasonable assumptions. Independent of the above said recent developments, we emphasize that our radio constraints apply to all models where dark matter annihilates to Zγ or Hγ.

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