标题： 衰变中微子在星系团中 显示英文标题

标题： Decaying Neutrinos in Galaxy Clusters

摘要： Davidsen等 (1991)认为，未能在星系团A665中检测到来自暗物质(DM)的紫外光子排除了衰变中微子假说。 Sciama等 (1993)认为，由于中心浓度高，该星系团中的DM必须是重子物质。 我们研究了使用Harrison--Zel'dovich密度涨落谱和先前从数值模拟中得出的振幅（Melott 1984b；Anninos等 1991）模拟的星系团中的DM分布，并且该振幅与微波背景涨落（Smoot等 1992）一致。 我们发现，使用此振幅归一化时，簇中中微子DM密度与观测到的簇DM值相当。 我们得出结论，在此归一化条件下，簇DM至少应主要由中微子组成。 Davidsen等的约束可以通过重子DM的存在而有所减弱；但根据我们的假设，这种约束无法被消除。 显示英文摘要

摘要： Davidsen et al. (1991) have argued that the failure to detect uv photons from the dark matter DM) in cluster A665 excludes the decaying neutrino hypothesis. Sciama et al. (1993) argued that because of high central concentration the DM in that cluster must be baryonic. We study the DM profile in clusters of galaxies simulated using the Harrison--Zel'dovich spectrum of density fluctuations, and an amplitude previously derived from numerical simulations (Melott 1984b; Anninos et al. 1991) and in agreement with microwave background fluctuations (Smoot et al. 1992). We find that with this amplitude normalization cluster neutrino DM densities are comparable to observed cluster DM values. We conclude that given this normalization, the cluster DM should be at least largely composed of neutrinos. The constraint of Davidsen et al. can be somewhat weakened by the presence of baryonic DM; but it cannot be eliminated given our assumptions.