Prospects for Annihilating Dark Matter in the inner Galactic halo by the Cherenkov Telescope Array

Abstract

We compute the sensitivity to dark matter annihilations for the forthcoming large Cherenkov Telescope Array (CTA) in several primary channels and over a range of dark matter masses from 30 GeV up to 80 TeV. For all channels, we include inverse Compton scattering of e${}^{\pm }$ by dark matter annihilations on the ambient photon background, which yields substantial contributions to the overall gamma-ray flux. We improve the analysis over previous work by: i) implementing a spectral and morphological analysis of the gamma-ray emission; ii) taking into account the most up-to-date cosmic ray background obtained from a full CTA Monte Carlo simulation and a description of the diffuse astrophysical emission; and iii) including the systematic uncertainties in the rich observational CTA datasets. We find that our spectral and morphological analysis improves the CTA sensitivity by roughly a factor 2. For the hadronic channels, CTA will be able to probe thermal dark matter candidates over a broad range of masses if the systematic uncertainties in the datasets will be controlled better than the percent level. For the leptonic modes, the CTA sensitivity will be well below the thermal value of the annihilation cross-section. In this case, even with larger systematics, thermal dark matter candidates up to masses of a few TeV will be easily studied.

arXiv comment15 pages, 4 figures, v2: Jfactors for two different DM profiles in Tab.1 added; two new plots added; some clarifications and some references added; results unchanged; matches version published on Phys. Rev. D

References in corpus (45)

• Particle Dark Matter: Evidence, Candidates and Constraints
• Asymptotic formulae for likelihood-based tests of new physics
• Non-Baryonic Dark Matter - Observational Evidence and Detection Methods
• The spectrum of isotropic diffuse gamma-ray emission between 100 MeV and 820 GeV
• PPPC 4 DM ID: A Poor Particle Physicist Cookbook for Dark Matter Indirect Detection
• Fermi-LAT Observations of the Diffuse Gamma-Ray Emission: Implications for Cosmic Rays and the Interstellar Medium
• The Milky Way's Circular Velocity Curve to 60 kpc and an Estimate of the Dark Matter Halo Mass from Kinematics of ~2400 SDSS Blue Horizontal Branch Stars
• On The Origin Of The Gamma Rays From The Galactic Center
• Discovery of Very-High-Energy Gamma-Rays from the Galactic Centre Ridge
• CMB Constraints on WIMP Annihilation: Energy Absorption During the Recombination Epoch
• Dark Matter Constraints from Observations of 25 Milky Way Satellite Galaxies with the Fermi Large Area Telescope
• Dark Matter and Pulsar Model Constraints from Galactic Center Fermi-LAT Gamma Ray Observations
• Very high energy gamma rays from the direction of Sagittarius A*
• CMB constraints on Dark Matter models with large annihilation cross-section
• Search for a Dark Matter annihilation signal from the Galactic Center halo with H.E.S.S
• GALPROP WebRun: an internet-based service for calculating galactic cosmic ray propagation and associated photon emissions
• Search for photon line-like signatures from Dark Matter annihilations with H.E.S.S
• Monte Carlo design studies for the Cherenkov Telescope Array
• Diffuse gamma ray constraints on annihilating or decaying Dark Matter after Fermi
• H.E.S.S. observations of the Galactic Center region and their possible dark matter interpretation
• Updated CMB constraints on Dark Matter annihilation cross-sections
• Stringent and Robust Constraints on the Dark Matter Annihilation Cross Section From the Region of the Galactic Center
• Dark Matter and Fundamental Physics with the Cherenkov Telescope Array
• Inverse Compton constraints on the Dark Matter e+e- excesses
• MAGIC Gamma-ray Telescope Observation of the Perseus Cluster of Galaxies: implications for cosmic rays, dark matter, and NGC1275
• Very high energy gamma rays from the composite SNR G0.9+0.1
• Constraints on Dark Matter annihilations from reionization and heating of the intergalactic gas
• Spectrum and variability of the Galactic Center VHE gamma-ray source HESS J1745-290
• WMAP7 and future CMB constraints on annihilating dark matter: implications for GeV-scale WIMPs
• Robust implications on Dark Matter from the first FERMI sky gamma map
• Constraints on Cosmic Rays, Magnetic Fields, and Dark Matter from Gamma-Ray Observations of the Coma Cluster of Galaxies with VERITAS and Fermi
• Search for dark matter annihilation signatures in H.E.S.S. observations of Dwarf Spheroidal Galaxies
• A realistic assessment of the CTA sensitivity to dark matter annihilation
• H.E.S.S. constraints on Dark Matter annihilations towards the Sculptor and Carina Dwarf Galaxies
• VERITAS Deep Observations of the Dwarf Spheroidal Galaxy Segue 1
• Observations of the Sagittarius Dwarf galaxy by the H.E.S.S. experiment and search for a Dark Matter signal
• Search for Dark Matter Annihilation Signals from the Fornax Galaxy Cluster with H.E.S.S
• VERITAS Search for VHE Gamma-ray Emission from Dwarf Spheroidal Galaxies
• Prospects for dark matter searches in the pMSSM
• Upper limit for gamma-ray emission above 140 GeV from the dwarf spheroidal galaxy Draco
• Upper Limits on the VHE gamma-ray Emission from the Willman 1 Satellite Galaxy with the MAGIC telescope
• A search for a dark matter annihilation signal towards the Canis Major overdensity with H.E.S.S
• Sensitivity of CTA to dark matter signals from the Galactic Center
• Prospects for a Dark Matter annihilation signal towards the Sagittarius dwarf galaxy with ground based Cherenkov telescopes
• Handling Systematic Uncertainties and Combined Source Analyses for Atmospheric Cherenkov Telescopes

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• Indirect and direct detection prospect for TeV dark matter in the MSSM-9
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• Testing dark matter with Cherenkov light -- prospects of H.E.S.S. and CTA for exploring minimal supersymmetry
• Prospects for annihilating Dark Matter towards Milky Way's dwarf galaxies by the Cherenkov Telescope Array
• Toward the ultimate reach of current imaging atmospheric Cherenkov telescopes and their sensitivity to TeV dark matter
• Dark Matter Line Searches with the Cherenkov Telescope Array
• Electro-Weak Dark Matter: non-perturbative effect confronting indirect detections
• Testing Type II Radiative Seesaw Model: from Dark Matter Detection to LHC Signatures
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• A two-loop induced neutrino mass model, dark matter, and LFV processes ${\ell }_i\to {\ell }_j\gamma$, and $\mu e\to ee$ in a hidden local $U(1)$ symmetry
• Dark Matter candidates in a Type-II radiative neutrino mass model
• Search for decaying heavy dark matter in an effective interaction framework: a comparison of $\gamma$-ray and radio observations
• Present and Future constraints on Secluded Dark Matter in the Galactic Halo with TeV Gamma-ray Observatories
• TeV gamma-ray sensitivity to velocity-dependent dark matter models in the Galactic Center
• Prospects of future MeV telescopes in probing weak-scale Dark Matter
• A Higgsploding Theory of Dark Matter
• Sensitivity of the Cherenkov Telescope Array to a dark matter signal from the Galactic centre
• Dark Matter phenomenology : from simplified WIMP models to refined alternative solutions
• WIMP Dark Matter in the U$\mu \nu$SSM
• Bayesian WIMP detection with the Cherenkov Telescope Array
• Closing the window on WIMP Dark Matter
• Probing the Dark Matter of Three-loop Radiative Neutrino Mass Generation Model with the Cherenkov Telescope Array
• Constraining Gamma-ray Lines from Dark Matter Annihilation using Fermi-LAT and H.E.S.S. data
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• Constraints on the Inert Doublet Model of dark matter with very high-energy gamma-ray observatories