arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2003.10416hep-phastro-ph.COastro-ph.HE
收藏

根据银河系中心的Fermi-LAT观测对热遗迹暗物质的强约束

Strong constraints on thermal relic dark matter from Fermi-LAT observations of the Galactic Center

Kevork N. Abazajian, Shunsaku Horiuchi, Manoj Kaplinghat, Ryan E. Keeley, Oscar Macias

摘要:

从费米-LAT观测中推断出的伽马射线向银河系中心(GC)延伸的过量被解释为是由于暗物质(DM)的湮灭。在这里,我们进行新的可能性分析的GC,并表明,当包括模板的恒星银河和核隆起,GC显示没有显着的检测DM湮灭模板,即使在慷慨的变化银河漫发射模型和广泛的DM晕配置文件。我们包括银河系的漫发射模型与三维逆康普顿地图的组合,星际气体地图的变化,和电子的中央源。对于DM配置文件,我们包括球形和椭球形DM形态和一系列的径向配置文件从陡峭的尖点千帕大小的核心,部分动力学模拟。我们推导出的暗物质湮灭通量的上限对DM属性有很强的约束。在纯$b$ -夸克湮灭通道的情况下,我们对湮灭截面的限制比那些从银河系矮星到DM质量约TeV的更严格,并排除了热遗迹截面高达约300 GeV。更好地了解DM配置文件,以及费米-LAT数据在其最高能量,将进一步提高DM属性的灵敏度。

英文摘要:

The extended excess toward the Galactic Center (GC) in gamma rays inferred from Fermi-LAT observations has been interpreted as being due to dark matter (DM) annihilation. Here, we perform new likelihood analyses of the GC and show that, when including templates for the stellar galactic and nuclear bulges, the GC shows no significant detection of a DM annihilation template, even after generous variations in the Galactic diffuse emission models and a wide range of DM halo profiles. We include Galactic diffuse emission models with combinations of three-dimensional inverse Compton maps, variations of interstellar gas maps, and a central source of electrons. For the DM profile, we include both spherical and ellipsoidal DM morphologies and a range of radial profiles from steep cusps to kiloparsec-sized cores, motivated in part by hydrodynamical simulations. Our derived upper limits on the dark matter annihilation flux place strong constraints on DM properties. In the case of the pure $b$-quark annihilation channel, our limits on the annihilation cross section are more stringent than those from the Milky Way dwarfs up to DM masses of approximately TeV and rule out the thermal relic cross section up to approximately 300 GeV. Better understanding of the DM profile, as well as the Fermi-LAT data at its highest energies, would further improve the sensitivity to DM properties.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑