Particle dark matter constraints from the Draco dwarf galaxy

Tyler, Craig

doi:10.1103/physrevd.66.023509

Cited by 60 publications

(58 citation statements)

References 43 publications

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“…In Ref. [72] radio fluxes are computed in this limit and the VLA measurement is exploited to exclude WIMP models; we have demonstrated in our discussion that the limit of no spatial diffusion is not likely to hold in the case of Draco and the figure illustrates the fact that, with the present data, limits on the model stemming from radio frequencies are less constraining than in the gammaray band. The figure illustrates also another point: the gamma-ray flux retraces the WIMP annihilation source function; in the example we have considered, even with the angular resolution at which future observations will be carried out, Draco would appear as a single point source.…”

Section: Multiwavelength Signals From Dracomentioning

confidence: 93%

Detecting dark matter WIMPs in the Draco dwarf: A multiwavelength perspective

2007

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We explore the possible signatures of dark matter pair annihilations in the nearby dwarf spheroidal galaxy Draco. After investigating the mass models for Draco in the light of available observational data, we carefully model the dark matter density profile, taking advantage of numerical simulations of hierarchical structure formation. We then analyze the gamma-ray and electron/positron yield expected for weakly interacting dark matter particle (WIMP) models, including an accurate treatment of the propagation of the charged particle species. We show that unlike in larger dark matter structures-such as galaxy clusters -spatial diffusion plays here an important role. While Draco would appear as a pointlike gamma-ray source, synchrotron emission from electrons and positrons produced by WIMP annihilations features a spatially extended structure. Depending upon the cosmic ray propagation setup and the size of the magnetic fields, the search for a diffuse radio emission from Draco can be a more sensitive indirect dark matter search probe than gamma rays. Finally, we show that available data are consistent with the presence of a black hole at the center of Draco: if this is indeed the case, very significant enhancements of the rates for gamma rays and other emissions related to dark matter annihilations are expected.

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Section: Multiwavelength Signals From Dracomentioning

confidence: 93%

Detecting dark matter WIMPs in the Draco dwarf: A multiwavelength perspective

2007

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“…Examples include gamma rays [514,515,516,517,518,519,520,521,522,523,524,525,526], lower energy photons such as radiowaves [516,527], and antimatter such as positrons and antiprotons [514,528,529,530,531,532,533,534,535]. The source of these cosmic rays will be concentrated towards the center of our galaxy.…”

Section: Neutralino Indirect Detectionmentioning

confidence: 99%

The soft supersymmetry-breaking Lagrangian: theory and applications

Chung

Everett

Kane³

et al. 2005

Physics Reports

415

339

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After an introduction recalling the theoretical motivation for low energy (100 GeV to TeV scale) supersymmetry, this review describes the theory and experimental implications of the soft supersymmetry-breaking Lagrangian of the general minimal supersymmetric standard model (MSSM). Extensions to include neutrino masses and nonminimal theories are also discussed. Topics covered include models of supersymmetry breaking, phenomenological constraints from electroweak symmetry breaking, flavor/CP violation, collider searches, and cosmological constraints including dark matter and implications for baryogenesis and inflation.

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“…The Draco dSph is one of the most frequently studied objects for indirect DM detection (Baltz et al 2000;Tyler 2002;Evans et al 2004;Colafrancesco et al 2007;Sánchez-Conde et al 2007;Strigari et al 2007Strigari et al , 2008Bringmann et al 2009a). It has an approximately spherically symmetric stellar distribution (Irwin & Hatzidimitriou 1995) with total luminosity of the order of 10 5 L (Piatek et al 2002).…”

Section: Observational Targetsmentioning

confidence: 99%

Veritas Search for Vhe Gamma-Ray Emission From Dwarf Spheroidal Galaxies

Acciari

Arlen

Aune

et al. 2010

ApJ

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Indirect dark matter searches with ground-based gamma-ray observatories provide an alternative for identifying the particle nature of dark matter that is complementary to that of direct search or accelerator production experiments. We present the results of observations of the dwarf spheroidal galaxies Draco, Ursa Minor, Boötes 1, and Willman 1 conducted by the Very Energetic Radiation Imaging Telescope Array System (VERITAS). These galaxies are nearby dark matter dominated objects located at a typical distance of several tens of kiloparsecs for which there are good measurements of the dark matter density profile from stellar velocity measurements. Since the conventional astrophysical background of very high energy gamma rays from these objects appears to be negligible, they are good targets to search for the secondary gamma-ray photons produced by interacting or decaying dark matter particles. No significant gamma-ray flux above 200 GeV was detected from these four dwarf galaxies for a typical exposure of ∼20 hr. The 95% confidence upper limits on the integral gamma-ray flux are in the range (0.4-2.2) × 10 −12 photons cm −2 s −1 . We interpret this limiting flux in the context of pair annihilation of weakly interacting massive particles (WIMPs) and derive constraints on the thermally averaged product of the total self-annihilation cross section and the relative velocity of the WIMPs ( σ v 10 −23 cm 3 s −1 for m χ 300 GeV c −2 ). This limit is obtained under conservative assumptions regarding the dark matter distribution in dwarf galaxies and is approximately 3 orders of magnitude above the generic theoretical prediction for WIMPs in the minimal supersymmetric standard model framework. However, significant uncertainty exists in the dark matter distribution as well as the neutralino cross sections which under favorable assumptions could further lower this limit.

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Particle dark matter constraints from the Draco dwarf galaxy

Cited by 60 publications

References 43 publications

Detecting dark matter WIMPs in the Draco dwarf: A multiwavelength perspective

Detecting dark matter WIMPs in the Draco dwarf: A multiwavelength perspective

The soft supersymmetry-breaking Lagrangian: theory and applications

Veritas Search for Vhe Gamma-Ray Emission From Dwarf Spheroidal Galaxies

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