矮球状星系中MeV暗物质的可能证据。
Possible evidence for MeV dark matter in dwarf spheroidals.
作者信息
Hooper Dan, Ferrer Francesc, Boehm Céline, Silk Joseph, Paul Jacques, Evans N Wyn, Casse Michel
机构信息
Astrophysics Department, University of Oxford, Oxford, United Kingdom.
出版信息
Phys Rev Lett. 2004 Oct 15;93(16):161302. doi: 10.1103/PhysRevLett.93.161302. Epub 2004 Oct 13.
The observed 511 keV emission from the galactic bulge could be due to very light (MeV) annihilating dark matter particles. To distinguish this hypothesis from conventional astrophysical sources, we study dwarf spheroidals in the region observed by the International Gamma-Ray Astrophysics Laboratory/SPI such as Sagittarius. As these galaxies have comparatively few stars, the prospects for 511 keV emission from standard astrophysical scenarios are minimal. The dwarf spheroidals do, however, contain copious amounts of dark matter. The observation of 511 keV emission from Sagittarius should be a "smoking gun" for MeV dark matter.
从银河系中心观测到的511 keV辐射可能是由极轻（兆电子伏特）的湮灭暗物质粒子引起的。为了将这一假设与传统天体物理源区分开来，我们研究了国际伽马射线天体物理实验室/ SPI观测区域内的矮球状星系，如人马座。由于这些星系中的恒星相对较少，标准天体物理场景产生511 keV辐射的可能性极小。然而，矮球状星系确实含有大量暗物质。对人马座511 keV辐射的观测应该是兆电子伏特暗物质的“确凿证据”。
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