On the detectability of Galactic dark matter annihilation into monochromatic gamma-rays  

作　　者：唐志成 袁强 毕效军 陈国明 

机构地区：[1]Institute of High Energy Physics,Chinese Academy of Sciences

出　　处：《Chinese Physics C》2011年第8期725-734,共10页中国物理C（英文版）

基　　金：Supported by Natural Science Foundation of China (10435070,10773011,10721140381,10099630);China Ministry of Science and Technology (2007CB16101,2010CB833000)

摘　　要：Monochromatic y-rays are thought to be the smoking gun signal for identifying dark matter annihilation. However, the flux of monochromatic y-rays is usually suppressed by virtual quantum effects since dark matter should be neutral and does not couple with y-rays directly. In this work, we study the detection strategy of the monochromatic y-rays in a future space-based detector. The flux of monochromatic y-rays between 50 GeV and several TeV is calculated by assuming the supersymmetric neutralino as a typical dark matter candidate. The detection both by focusing on the Galactic center and in a scan mode that detects y-rays from the whole Galactic halo are compared. The detector performance for the purpose of monochromatic y-ray detection, with different energy and angular resolution, field of view, and background rejection efficiencies, is carefully studied with both analytical and fast Monte-Carlo methods.Monochromatic y-rays are thought to be the smoking gun signal for identifying dark matter annihilation. However, the flux of monochromatic y-rays is usually suppressed by virtual quantum effects since dark matter should be neutral and does not couple with y-rays directly. In this work, we study the detection strategy of the monochromatic y-rays in a future space-based detector. The flux of monochromatic y-rays between 50 GeV and several TeV is calculated by assuming the supersymmetric neutralino as a typical dark matter candidate. The detection both by focusing on the Galactic center and in a scan mode that detects y-rays from the whole Galactic halo are compared. The detector performance for the purpose of monochromatic y-ray detection, with different energy and angular resolution, field of view, and background rejection efficiencies, is carefully studied with both analytical and fast Monte-Carlo methods.

关 键 词：dark matter line emission GAMMA-RAY DETECTABILITY 

分 类 号：P145.9[天文地球—天体物理]