Detection of Sub-TeV gamma-rays from the Galactic Center with the CANGAROO-II telescope

Tsuchiya, K.

doi:10.1063/1.1878437

Cited by 29 publications

(45 citation statements)

References 13 publications

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“…On the other hand, data on the gamma-ray flux in the Galactic center (GC) direction are already relevant to set combined constraints on our particle physics framework and the dark halo profile. Gamma-ray maps of the GC have been derived both from space, by the EGRET experiment on the Compton Gamma-Ray Observatory, below 10 GeV [50], and, more recently, from ground by three different air Cherenkov telescopes (ACTs), with an overall energy coverage between 300 GeV and 8 TeV, and apparently discrepant results concerning spectral shapes of the source and normalization of the flux [51,52,53]. An interpretation of one of these signals in term of WIMP pair annihilations is possible, see, e.g., the modeling of the EGRET source in Ref.…”

Section: As Performed By Egret (Left) and By Hess (Right) The Upmentioning

confidence: 99%

Neutralino dark matter detection in split supersymmetry scenarios

2005

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We study the phenomenology of neutralino dark matter within generic supersymmetric scenarios where the Gaugino and Higgsino masses are much lighter than the scalar soft breaking masses (Split Supersymmetry). We consider a low-energy model-independent approach and show that the guidelines in the definition of this general framework come from cosmology, which forces the lightest neutralino to have a mass smaller than 2.2 TeV. The testability of the framework is addressed by discussing all viable dark matter detection techniques. Current data on cosmic rays antimatter, gamma-rays and on the abundance of primordial 6 Li already set significant constraints on the parameter space. Complementarity among future direct detection experiments, indirect searches for antimatter and with neutrino telescopes, and tests of the theory at future accelerators, such as the LHC and a NLC, is highlighted. In particular, we study in detail the regimes of Wino-Higgsino mixing and Bino-Wino transition, which have been most often neglected in the past. We emphasize that our analysis may apply to more general supersymmetric models where scalar exchanges do not provide the dominant contribution to annihilation rates.

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Section: As Performed By Egret (Left) and By Hess (Right) The Upmentioning

confidence: 99%

Neutralino dark matter detection in split supersymmetry scenarios

2005

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“…Recently, observations by the Atmospheric Cerenkov Telescopes (ACTs) HESS [2], Whipple [3] and Cangaroo [4] have revealed the presence of a very bright gamma-ray source from this direction. The spectrum of this source has been measured in steadily increasing detail by the HESS collaboration [2].…”

Section: Introductionmentioning

confidence: 99%

Dark matter and gamma rays from Draco: MAGIC, GLAST and CACTUS

Bergström

Hooper

2006

Phys. Rev. D

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The dwarf spheroidal galaxy Draco has long been considered likely to be one of the brightest point sources of gamma-rays generated through dark matter annihilations. Recent studies of this object have found that it remains largely intact from tidal striping, and may be more massive than previously thought. In this article, we revisit Draco as a source of dark matter annihilation radiation, with these new observational constraints in mind. We discuss the prospects for the experiments MAGIC and GLAST to detect dark matter in Draco, as well as constraints from the observations of EGRET. We also discuss the possibility that the CACTUS experiment has already detected gamma-rays from Draco. We find that it is difficult to generate the flux reported by CACTUS without resorting to non-thermally produced WIMPs and/or a density spike in Draco's dark matter distribution due to the presence of an intermediate mass black hole. We also find that for most annihilation modes, a positive detection of Draco by CACTUS would be inconsistent with the lack of events seen by EGRET. PACS numbers: 95.35.+d;95.30.Cq,98.52.Wz,95.55.Ka

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“…A steep energy spectrum dN/dE ∝ E −4.6 was reported with an integral flux at the level of 10% of the Crab Nebula flux [6]. Shortly after, evidence at the level of 3.7 standard deviations (s.d.)…”

Section: B the Galactic Center Seen At Gev/tev Energiesmentioning

confidence: 99%

The galactic center region imaged by VERITAS from 2010-2012

Beilicke

2012

AIP Conference Proceedings

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The Galactic Center has long been a region of interest for high-energy and very-high-energy observations. Many potential sources of GeV/TeV γ-ray emission have been suggested, e.g., the accretion of matter onto the black hole, cosmic rays from a nearby supernova remnant, or the annihilation of dark matter particles. The Galactic Center has been detected at MeV/GeV energies by EGRET and recently by Fermi/LAT. At GeV/TeV energies, the Galactic Center was detected by different ground-based Cherenkov telescopes such as CANGAROO, Whipple 10 m, H.E.S.S., and MAGIC. We present the results from 15 hrs of VERITAS observations conducted at large zenith angles, resulting in a >10 standard deviation detection and confirmation of the high-energy spectrum observed by H.E.S.S. The combined Fermi/VERITAS results are compared to astrophysical models.

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Detection of Sub-TeV gamma-rays from the Galactic Center with the CANGAROO-II telescope

Cited by 29 publications

References 13 publications

Neutralino dark matter detection in split supersymmetry scenarios

Neutralino dark matter detection in split supersymmetry scenarios

Dark matter and gamma rays from Draco: MAGIC, GLAST and CACTUS

The galactic center region imaged by VERITAS from 2010-2012

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