A search for a dark matter annihilation signal toward the Canis Major overdensity with H.E.S.S.

摘要: A search for a dark matter (DM) annihilation signal into $\gamma$-rays toward the direction of Canis Major (CMa) overdensity is presented. The nature CMa still controversial and one scenario represents it as dwarf galaxy, making an interesting candidate DM searches. total 9.6 hours high quality data were collected with H.E.S.S. array Imaging Atmospheric Cherenkov Telescopes (IACTs) no evidence very energy $\gamma$-ray found. Upper limits on galaxy mass order 10$^{9}$ M$_{\odot}$ are derived at 95% C.L. assuming neutralino masses in range 500 GeV - 10 TeV relatively large cross-sections. Constraints velocity-weighted cross section $ $, calculated specific WIMP scenarios, using NFW model halo profile taking advantage numerical simulations hierarchical structure formation. exclusion 5 $\times$ 10$^{-24}$ cm$^{3}$ s$^{-1}$ reached particle interval, 3 10$^{8}$ M$_{\odot}$.