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arXiv 0908.4127astro-ph.HEastro-ph.GA
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暗物质湮灭为γ射线和带电粒子的鲁棒约束

Robust Constraints on Dark Matter Annihilation into Gamma Rays and Charged Particles

T. D. Jacques

摘要:

利用银河系、仙女座星系(M31)和宇宙背景观测的伽马射线数据,我们计算了在宽范围的暗物质质量下,暗物质自湮灭截面到一些最终状态的保守上限。我们首先约束湮灭一对单能伽马射线,并表明,在一般情况下,我们的结果是不变的更广泛的湮灭谱,如果至少有几个伽马射线产生的能量在几个因素的暗物质质量。然后,我们把约束的自湮灭截面的电子-正电子对,使用伽马射线产生的内部韧致辐射校正。我们还对其他带电轻子的湮灭施加了限制。我们保守的假设,天体物理的输入,并证明我们的推导出的界限将得到加强,如果更强的假设,这些输入。

英文摘要:

Using gamma-ray data from observations of the Milky Way, Andromeda (M31), and the cosmic background, we calculate conservative upper limits on the dark matter self-annihilation cross section to a number of final states, over a wide range of dark matter masses. We first constrain annihilation to a pair of monoenergetic gamma rays, and show that in general our results are unchanged for a broader annihilation spectrum, if at least a few gamma rays are produced with energies within a factor of a few from the dark matter mass. We then place constraints on the self-annihilation cross section to an electron-positron pair, using gamma rays produced via internal bremsstrahlung radiative corrections. We also place constraints on annihilation into the other charged leptons. We make conservative assumptions about the astrophysical inputs, and demonstrate how our derived bounds would be strengthened if stronger assumptions about these inputs are adopted.

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