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The spatial distribution of dark matter annihilation originating from a gamma-ray line signal 被引量:1
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作者 tong-suo lu Tie-Kuang Dong Jian Wu 《Research in Astronomy and Astrophysics》 SCIE CAS CSCD 2014年第5期520-526,共7页
The GeV-TeV -γ-ray line signal is the smoking gun signature of dark matter annihilation or decay. The detection of such a signal is one of the main targets of some space-based telescopes, including Fermi-LAT and the ... The GeV-TeV -γ-ray line signal is the smoking gun signature of dark matter annihilation or decay. The detection of such a signal is one of the main targets of some space-based telescopes, including Fermi-LAT and the upcoming missions CALET, DAMPE and Gamma-400. An important feature of γ-ray line photons that originate from dark-matter-annihilation is that they are concentrated at the center of the Galaxy. So far, no reliable γ-ray line has been detected by Fermi-LAT, and the upper limits on the cross section of annihilation into "y-rays have been reported. We use these upper limits to estimate the "maximal" number of -y-ray line photons detectable for Fermi- LAT, DAMPE and Gamma-400, and then investigate the spatial distribution of these photons. We show that the center of the distribution will usually be offset from the Galactic center (Sgr A*) due to the limited statistics. Such a result is almost indepen- dent of models of the dark matter distribution, and will render the reconstruction of the dark matter distribution with the γ-ray line signal very challenging for foreseeable space-based detectors. 展开更多
关键词 COSMOLOGY observations -- cosmology dark matter -- Galaxy center-- instrumentation detectors
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