Gamma ray constraints on decaying dark matter

By Marco Cirelli, E. Moulin, P. Panci, P. Serpico, A. Viana. 2012

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We derive new bounds on decaying Dark Matter from the gamma ray measurements of (i) the isotropic residual (extragalactic) background by Fermi and (ii) the Fornax galaxy cluster by H.E.S.S.. We nd that those from (i) are among the most stringent constraints currently available, for a large range of DM masses and a variety of decay modes, excluding half-lives up to 10 26 to few 10 27 seconds. In particular, they rule out the interpretation in terms of decaying DM of the e spectral features in PAMELA, Fermi and H.E.S.S., unless very conservative choices are adopted. We also discuss future prospects for CTA bounds from Fornax which, contrary to the present H.E.S.S. constraints of (ii), may allow for an interesting improvement and may become better than those from the current or future extragalactic Fermi data.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/18f9a41e9acff35790ef08574d2618cb8e4de1c6

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Citations in the corpus

Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects (2012, background): “For most of this review, we will assume that DM consists of WIMPs; many aspects, however, can be applied – or generalized in a straight-forward way – to other cases as well, most notably decaying DM [35, 36] (for which one simply has to replace 1 2〈σv〉ρχ → mχΓρχ in Eq.”
Galactic Searches for Dark Matter (2012, background): “some instances by the signal from diuse background radiation from extragalactic sources, which in many instances constitute a background to the signal that is to be observed (Cembranos et al., 2007; Cirelli et al., 2012). 6.5. Neutrinos In addition to the above discussed signatures from high energy ”
Dark matter annihilations and decays after the AMS-02 positron measurements (2013, unknown): “[53] from the extragalactic gamma-ray background.”
A review of indirect searches for particle dark matter (2016, background): “The Fermi LAT measurement of the IGRB spectrum allows strong constraints to be placed on dark matter fluxes from annihilation and decay in certain scenarios [203,210,211].”
Cosmological constraints on exotic injection of electromagnetic energy (2016, background): “from gamma-ray flux measurements, see for instance [44]) which we do not discuss here in detail but that, for phenomena happening mostly in the late universe (z 1) and involving sufficiently high energy particles (E MeV), are more constraining than cosmological ones.”
Strongest model-independent bound on the lifetime of Dark Matter (2014, background): “Stringent bounds on the lifetime τ of WIMP DM candidates with electroweak scale masses come, for example, from the diffuse gamma ray flux , at the level of τ 1026 s, see for instance [2].”
Optimized dark matter searches in deep observations of Segue 1 with MAGIC (2013, methodology): “This is reflected in the fact that the predicted limits for ∼15 hours observations of Fornax are of the same order of the ones we obtain for ∼160 hours of Segue 1 data [57].”
Limits on dark matter annihilation signals from the Fermi LAT 4-year measurement of the isotropic gamma-ray background (2015, background): “[109, 110]), since the DM Galactic component is more isotropic compared to the annihilating DM case.”