The Characterization of the Gamma-Ray Signal from the Central Milky Way: A Compelling Case for Annihilating Dark Matter
作者： Tansu Daylan , Douglas P. Finkbeiner , Dan Hooper , Tim Linden , Stephen K.N. Portillo
DOI: 10.1016/J.DARK.2015.12.005
关键词: Center (category theory) 、 Dark matter 、 Fermi Gamma-ray Space Telescope 、 Physics 、 Scalar field dark matter 、 Hot dark matter 、 Astrophysics 、 Galactic plane 、 Milky Way 、 Galactic Center
摘要: Past studies have identified a spatially extended excess of $\sim$1-3 GeV gamma rays from the region surrounding Galactic Center, consistent with emission expected annihilating dark matter. We revisit and scrutinize this signal intention further constraining its characteristics origin. By applying cuts to \textit{Fermi} event parameter CTBCORE, we suppress tails point spread function generate high resolution gamma-ray maps, enabling us more easily separate various components. Within these find be robust highly statistically significant, spectrum, angular distribution, overall normalization that is in good agreement predicted by simple matter models. For example, very well fit 36-51 particle $b\bar{b}$ an annihilation cross section $\sigma v = (1-3)\times 10^{-26}$ cm$^3$/s (normalized local density 0.4 GeV/cm$^3$). Furthermore, confirm distribution approximately spherically symmetric centered around dynamical center Milky Way (within $\sim$$0.05^{\circ}$ Sgr A$^*$), showing no sign elongation along Plane. The observed extend at least $\simeq10^{\circ}$ disfavoring possibility originates millisecond pulsars.
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