Multi-wavelength signals of dark matter annihilations at the Galactic center

Abstract

We perform a systematic study of the multi-wavelength signal induced by weakly interacting massive particle (WIMP) annihilations at the Galactic Center (GC). Referring to a generic WIMP dark matter (DM) scenario and depending on astrophysical inputs, we discuss spectral and angular features and sketch correlations among signals in the different energy bands. None of the components which have been associated to the GC source Sgr A*, nor the diffuse emission components from the GC region, have spectral or angular features typical of a DM source. Still, data-sets at all energy bands, namely, the radio, near infrared, X-ray and gamma-ray bands, contribute to place significant constraints on the WIMP parameter space. In general, the gamma-ray energy range is not the one with the largest signal to background ratio. In the case of large magnetic fields close to the GC, X-ray data give the tightest bounds. The emission in the radio-band, which is less model dependent, is very constraining as well. The recent detection by HESS of a GC gamma-ray source, and of a diffuse gamma-ray component, limits the possibility of a DM discovery with next generation of gamma-ray telescopes, like GLAST and CTA. We find that the most of the region in the parameter space accessible to these instruments is actually already excluded at other wave-lenghts. On the other hand, there may be still an open window to improve constraints with wide-field radio observations.

26 pages, 32 figures, treatments of starlight and interstellar medium improved, other minor changes, references added

References in corpus (11)

• Spatial distribution of interstellar gas in the innermost 3 kpc of our Galaxy
• Evidence Of Dark Matter Annihilations In The WMAP Haze
• Baryonic Pinching of Galactic Dark Matter Halos
• Detecting dark matter WIMPs in the Draco dwarf: a multi-wavelength perspective
• TeV gamma-rays and the largest masses and annihilation cross sections of neutralino dark matter
• Model-independent dark matter annihilation bound from the diffuse gamma ray flux
• Challenges in Detecting Gamma-Rays From Dark Matter Annihilations in the Galactic Center
• Extracting the Gamma Ray Signal from Dark Matter Annihilation in the Galactic Center Region
• A Possible Link Between the Galactic Center HESS Source and Sgr A*
• X-ray Radiation from the Annihilation of Dark Matter at the Galactic Center
• Localising the H.E.S.S. Galactic Centre point source

Cited by in corpus (40)

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• Gamma Rays from Clusters and Groups of Galaxies: Cosmic Rays versus Dark Matter
• Extragalactic Inverse Compton Light from Dark Matter Annihilation and the Pamela Positron Excess
• Complementarity of direct dark matter detection and indirect detection through gamma-rays
• The EMU view of the Large Magellanic Cloud: Troubles for sub-TeV WIMPs
• Searching for Dark Matter with X-ray Observations of Local Dwarf Galaxies
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• Testing the Dark Matter Interpretation of the PAMELA Excess through Measurements of the Galactic Diffuse Emission
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• Gamma-ray and Synchrotron Radiation from Dark Matter annihilations in Ultra-faint Dwarf Galaxies
• Illuminating Black Hole Shadow with Dark Matter Annihilation
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• Constraints on annihilating dark matter in the Omega Centauri cluster
• Radio bounds on the mixed dark matter scenarios of primordial black holes and WIMPs
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• A new method to constrain annihilating dark matter
• Constraining annihilating dark matter by x-ray data
• Photons from Dark Matter in a (non-Universal) Extra Dimension model
• Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
• Neutralino Dark Matter as the Source of the WMAP Haze
• Indirect evidence of GeV Dark Matter
• WIMP constraints from black hole low-mass X-ray binaries