A new target object for constraining annihilating dark matter

Abstract

In the past decade, gamma-ray observations and radio observations of our Milky Way and the Milky Way dwarf spheroidal satellite galaxies put very strong constraints on annihilation cross sections of dark matter. In this article, we suggest a new target object (NGC 2976) that can be used for constraining annihilating dark matter. The radio and x-ray data of NGC 2976 can put very tight constraints on the leptophilic channels of dark matter annihilation. The lower limits of dark matter mass annihilating via $e^{+}{e}^{-}$, ${\mu }^{+}{\mu }^{-}$ and ${\tau }^{+}{\tau }^{-}$ channels are 200 GeV, 130 GeV and 110 GeV respectively with the canonical thermal relic cross section. We suggest that this kind of large nearby dwarf galaxies with relatively high magnetic field can be good candidates for constraining annihilating dark matter in future analysis.

Accepted for publication in The Astrophysical Journal

References in corpus (10)

• Precise Relic WIMP Abundance and its Impact on Searches for Dark Matter Annihilation
• Searching for Dark Matter Annihilation in Recently Discovered Milky Way Satellites with Fermi-LAT
• A Tale of Tails: Dark Matter Interpretations of the Fermi GeV Excess in Light of Background Model Systematics
• Gamma-ray and radio tests of the e+e- excess from DM annihilations
• Detecting dark matter WIMPs in the Draco dwarf: a multi-wavelength perspective
• A Comprehensive Search for Dark Matter Annihilation in Dwarf Galaxies
• A new look at the cosmic ray positron fraction
• Gravitational Radiation from First-Order Phase Transitions
• Searching for Dark Matter with X-ray Observations of Local Dwarf Galaxies
• Revisiting the constraints on annihilating dark matter by radio observational data of M31