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Decaying dark matter in dwarf spheroidal galaxies: Prospects for X-ray and gamma-ray telescopes

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arxiv 2103.13242 v1 pith:T7NW4YKU submitted 2021-03-24 astro-ph.HE astro-ph.COhep-ph

Shin'ichiro Ando , Suvendu K. Barik , Zhuoran Feng , Marco Finetti , Andreas Guerra Chaves , Sahaja Kanuri , Jorinde Kleverlaan , Yixuan Ma
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Nicolo Maresca Di Serracapriola Matthew S. P. Meinema Imanol Navarro Martinez Kenny C. Y. Ng Ebo Peerbooms Casper A. van Veen Fabian Zimmer
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classification astro-ph.HEastro-ph.COhep-ph
keywords darkmattergalaxiesdwarfdecaystelescopesx-rayestimates
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abstract

Dwarf spheroidal galaxies are dark matter dominated systems, and as such, ideal for indirect dark matter searches. If dark matter decays into high-energy photons in the dwarf galaxies, they will be a good target for current and future generations of X-ray and gamma-ray telescopes. By adopting the latest estimates of density profiles of dwarf galaxies in the Milky Way, we revise the estimates dark matter decay rates in dwarf galaxies; our results are more robust, but weaker than previous estimates. Applying these results, we study the detectability of dark matter decays with X-ray and very-high-energy gamma-ray telescopes, such as eROSITA, XRISM, Athena, HAWC, and CTA. Our projection shows that all of these X-ray telescopes will be able to critically assess the claim of the 7 keV sterile neutrino decays from stacked galaxy clusters and nearby galaxies. For TeV decaying dark matter, we can constrain its lifetime to be longer than $\sim$10$^{27}$-10$^{28}$ s. We also make projections for future dwarf galaxies that would be newly discovered with the Vera Rubin Observatory Legacy Survey of Space and Time, which will further improve the expected sensitivity to dark matter decays both in the keV and PeV mass ranges.

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Forward citations

Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Cosmological evolution with decaying dark matter: an integral-equation approach

    astro-ph.CO 2026-07 accept novelty 6.0 of 10

    CLASSIER-DDM evaluates generic two-body decaying dark matter perturbations via iterative integral equations at O(0.1%) accuracy and O(1 min) cost without a Boltzmann hierarchy or fluid approximation.

  2. CPon Dark Matter

    hep-ph 2024-11 conditional novelty 6.0 of 10

    A light scalar from spontaneous CP violation, the CPon, can be a viable dark matter candidate with a mass between about 10 meV and 1 MeV and a suppression scale above 10^12 GeV.

  3. Sterile neutrino Dark Matter in the minimal Dirac Seesaw

    hep-ph 2026-03 conditional novelty 5.0 of 10

    A minimal Dirac seesaw model yields viable sterile-neutrino dark matter via freeze-in, with the right-handed mixing angle θ_R bypassing X-ray bounds.

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