A new target object for constraining annihilating dark matter

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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 paper, 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⁻, μ⁺μ⁻, and τ⁺τ⁻ 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 galaxy with a relatively high magnetic field can be a good candidate for constraining annihilating dark matter in future analyses. Copyright © 2017 The American Astronomical Society. All rights reserved.
Original languageEnglish
Article number9
JournalAstrophysical Journal
Issue number1
Publication statusPublished - Jul 2017


dark matter
cross section
radio observation
cross sections
dwarf galaxies
gamma rays
magnetic field
magnetic fields
x rays


Chan, M. H. (2017, July). A new target object for constraining annihilating dark matter. Astrophysical Journal, 844(1). Retrieved from http://dx.doi.org/10.3847/1538-4357/aa767e


  • Dark matter