Stringent Constraints On The Dark Matter Annihilation Cross Section From Subhalo Searches With The Fermi Gamma-Ray Space Telescope

作者： Asher Berlin , Dan Hooper

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摘要: The dark matter halo of the Milky Way is predicted to contain a very large number smaller subhalos. As result annihilations taking place within such objects, most nearby and massive subhalos could appear as pointlike or spatially extended gamma-ray sources, without observable counterparts at other wavelengths. In this paper, we use results Aquarius simulation predict distribution compare characteristics unidentified sources observed by Fermi Gamma-Ray Space Telescope. Focusing on brightest high latitude comparison derive limits annihilation cross section. For particles lighter than $\ensuremath{\sim}200\text{ }\text{ }\mathrm{GeV}$, resulting are strongest obtained date, being modestly more stringent those derived from observations dwarf galaxies Galactic center. We also independent based lack with discernible spatial extension, but these factor $\ensuremath{\sim}2--10$ weaker Lastly, note that four ten high-latitude exhibit similar spectral shape, consistent 30--60 GeV annihilating $b\overline{b}$ an section order $\ensuremath{\sigma}v\ensuremath{\sim}(5--10)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}27}\text{ }{\mathrm{cm}}^{3}/\mathrm{s}$ 8--10 ${\ensuremath{\tau}}^{+}{\ensuremath{\tau}}^{\ensuremath{-}}$ $\ensuremath{\sigma}v\ensuremath{\sim}(1.5--3.0)\ifmmode\times\else\texttimes\fi{}1{0}^{\ensuremath{-}27}\text{ }{\mathrm{cm}}^{3}/\mathrm{s}$.

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Stringent Constraints On The Dark Matter Annihilation Cross Section From Subhalo Searches With The Fermi Gamma-Ray Space Telescope

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Stringent Constraints On The Dark Matter Annihilation Cross Section From Subhalo Searches With The Fermi Gamma-Ray Space Telescope

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