Gamma-ray constraints on hadronic and leptonic activities of decaying dark matter

Chen, Chuan-Ren; Mandal, Sourav K.; Takahashi, Fuminobu

doi:10.1088/1475-7516/2010/01/023

Cited by 35 publications

(37 citation statements)

References 69 publications

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“…(Similar sensitivity may be achieved with the isotropic diffuse flux measured by Fermi; see Ref. [50] for relevant limits on the process χ → e ± .) The response functions reported all assume a NFW halo profile.…”

Section: In-flight and At-rest Annihilationssupporting

confidence: 58%

Lifetime constraints for late dark matter decay

2010

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We consider a class of late-decaying dark-matter models, in which a dark matter particle decays to a heavy stable daughter of approximately the same mass, together with one or more relativistic particles which carry away only a small fraction of the parent rest mass. Such decays can affect galactic halo structure and evolution, and have been invoked as a remedy to some of the small-scale structure-formation problems of cold dark matter. There are existing stringent limits on the dark matter lifetime if the decays produce photons. By considering examples in which the relativistic decay products instead consist of neutrinos or electron-position pairs, we derive stringent limits on these scenarios for a wide range of dark matter masses. We thus eliminate a sizable portion of the parameter space for these late-decay models if the dominant decay channel involves Standard Model final states.PACS numbers: 95.35.+d, 95.85.Pw, 98.62.Gq, 98.70.Vc

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Section: In-flight and At-rest Annihilationssupporting

confidence: 58%

Lifetime constraints for late dark matter decay

2010

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“…TeV and with a lifetime of the order of τ ∼ 10 26 s [54,57,58]. The VERITAS limits on the dark matter particle decay lifetime are at least an order of magnitude away from the best fits to the Fermi and PAMELA data (see Figure 4) and do not rule out these models.…”

Section: Lower Limits On the Decay Lifetimementioning

confidence: 80%

“…Such astrophysical enhancements, combined with particle physics enhancements, have been proposed as an explanation for the cosmic ray lepton anomalies [43,52,53]. Finally, decaying dark matter models have also been suggested to explain the lepton excesses and are good alternatives to annihilating dark matter models [54][55][56][57][58].…”

Section: Introductionmentioning

confidence: 99%

VERITAS deep observations of the dwarf spheroidal galaxy Segue 1

Aliu¹,

Archambault²,

Arlen³

et al. 2012

Phys. Rev. D

104

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The VERITAS array of Cherenkov telescopes has carried out a deep observational program on the nearby dwarf spheroidal galaxy Segue 1. We report on the results of nearly 48 hours of good quality selected data, taken between January 2010 and May 2011. No significant γ-ray emission is detected at the nominal position of Segue 1, and upper limits on the integrated flux are derived. According to recent studies, Segue 1 is the most dark matter-dominated dwarf spheroidal galaxy currently known. We derive stringent bounds on various annihilating and decaying dark matter particle models. The upper limits on the velocity-weighted annihilation cross-section are σv 95% CL < ∼ 10 −23 cm 3 s −1 , improving our limits from previous observations of dwarf spheroidal galaxies by at least a factor of two for dark matter particle masses m χ > ∼ 300 GeV. The lower limits on the decay lifetime are at the level of τ 95% CL > ∼ 10 24 s. Finally, we address the interpretation of the cosmic ray lepton anomalies measured by ATIC and PAMELA in terms of dark matter annihilation, and show that the VERITAS observations of Segue 1 disfavor such a scenario.

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“…These lifetimes are not currently excluded by other γ -ray constraints and the latter case gives a good fit to the PAMELA-measured positron fraction excess (e.g., Cirelli et al 2010;Chen et al 2010;Meade et al 2010;Zhang et al 2010).…”

Section: Fermi Satellite Observation Simulationsmentioning

confidence: 98%

DARK MATTER DECAY AND ANNIHILATION IN THE LOCAL UNIVERSE: CLUES FROM FERMI

Cuesta

Jeltema

Zandanel

et al. 2010

ApJ

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We present all-sky simulated Fermi maps of γ -rays from dark matter (DM) decay and annihilation in the local universe. The DM distribution is obtained from a constrained cosmological simulation of the neighboring large-scale structure provided by the CLUES project. The DM fields of density and density squared are then taken as an input for the Fermi observation simulation tool to predict the γ -ray photon counts that Fermi would detect in 5 years of an all-sky survey for given DM models. Signal-to-noise ratio (S/N) sky maps have also been obtained by adopting the current Galactic and isotropic diffuse background models released by the Fermi Collaboration. We point out the possibility for Fermi to detect a DM γ -ray signal in local extragalactic structures. In particular, we conclude here that Fermi observations of nearby clusters (e.g., Virgo and Coma) and filaments are expected to give stronger constraints on decaying DM compared to previous studies. As an example, we find a significant S/N in DM models with a decay rate fitting the positron excess as measured by PAMELA. This is the first time that DM filaments are shown to be promising targets for indirect detection of DM. On the other hand, the prospects for detectability of annihilating DM in local extragalactic structures are less optimistic even with extreme cross-sections. We make the DM density and density squared maps publicly available online.

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Gamma-ray constraints on hadronic and leptonic activities of decaying dark matter

Cited by 35 publications

References 69 publications

Lifetime constraints for late dark matter decay

Lifetime constraints for late dark matter decay

VERITAS deep observations of the dwarf spheroidal galaxy Segue 1

DARK MATTER DECAY AND ANNIHILATION IN THE LOCAL UNIVERSE: CLUES FROM FERMI

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