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arXiv 0709.2301astro-phhep-ph
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M31的XMM-牛顿观测对暗物质衰变的约束

Constraints on decaying Dark Matter from XMM-Newton observations of M31

Alexey Boyarsky, Dmytro Iakubovskyi, Oleg Ruchayskiy, Vladimir Savchenko

摘要:

利用仙女座星系(M31)的XMM-牛顿EPIC谱,推导出辐射衰减暗物质(DM)粒子参数的约束条件。利用M31外围(5 '-13')部分的观测,我们改进了现有的约束条件。对于无菌中微子DM的情况,结合我们的约束条件和Dodelson-Widrow(DW)方案中最新的无菌中微子丰度计算结果,我们得到了质量下限ms < 4 keV,这比最近由Aesthetal.(2007)[hep-ph/0612182]得到的ms < 6 keV更强.将该极限与Viel等人(2007)[arXiv:0709.0131](m_s > 5.6 kev)的莱曼α森林分析的最新结果进行比较,我们认为排除了所有DM都是通过DW机制产生的情况。然而,我们讨论其他的生产机制,并指出,不育中微子仍然是一个可行的候选人的暗物质,无论是温暖或寒冷。

英文摘要:

We derive constraints on parameters of the radiatively decaying Dark Matter (DM) particles, using XMM-Newton EPIC spectra of the Andromeda galaxy (M31). Using the observations of the outer (5'-13') parts of M31 we improve the existing constraints. For the case of sterile neutrino DM, combining our constraints with the latest computation of abundances of sterile neutrino in the Dodelson-Widrow (DW) scenario, we obtain the lower mass limit m_s < 4 keV, which is stronger than the previous one m_s < 6 kev, obtained recently by Asaka et al. (2007) [hep-ph/0612182]. Comparing this limit with the most recent results on Lyman-alpha forest analysis of Viel et al. (2007) [arXiv:0709.0131] (m_s > 5.6 kev), we argue that the scenario in which all the DM is produced via DW mechanism is ruled out. We discuss however other production mechanisms and note that the sterile neutrino remains a viable candidate of Dark Matter, either warm or cold.

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