γ-ray anisotropies from dark matter in the Milky Way: the role of the radial distribution

@article{Calore2014rayAF,
  title={$\gamma$-ray anisotropies from dark matter in the Milky Way: the role of the radial distribution},
  author={Francesca Calore and Valentina de Romeri and M. Di Mauro and Fiorenza Donato and Jakob Herpich and Andrea V. Macci{\`o} and Luca Maccione},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2014},
  volume={442},
  pages={1151-1156}
}
The annihilation of dark matter particles in the halo of galaxies may end up into γ-rays, which travel almost unperturbed till to their detection at the Earth. This annihilation signal can exhibit an anisotropic behaviour quantified by the angular power spectrum, whose properties strongly depend on the dark matter distribution and its clumpiness. We use high resolution pure dark matter N-body simulations to quantify the contribution of different components (main halo and satellites) to the… 

Figures from this paper

Can galactic dark matter substructure contribute to the cosmic gamma-ray anisotropy?
The annihilation of dark matter (DM) particles in the Milky Way can contribute to the diffuse gamma-ray background (DGRB). Due to the presence of substructures, this emission will appear anisotropic
Realistic estimation for the detectability of dark matter sub-halos with Fermi-LAT
Numerical simulations of structure formation have recorded a remarkable progress in the recent years, in particular due to the inclusion of baryonic physics evolving with the dark matter component.
Dark matter substructure modelling and sensitivity of the Cherenkov Telescope Array to Galactic dark halos
Hierarchical structure formation leads to a clumpy distribution of dark matter in the Milky Way. These clumps are possible targets to search for dark matter annihilation with present and future γ-ray
Isotropic diffuse gamma-ray background: unveiling Dark Matter components beyond the contribution of astrophysical sources
We present the first interpretation of the new isotropic diffuse gamma-ray background (IGRB), measured by the Fermi Large Area Telescope (LAT), based on a statistical analysis. We demonstrate that
DIFFUSE γ-RAY EMISSION FROM GALACTIC PULSARS
Millisecond pulsars (MSPs) are old fast-spinning neutron stars that represent the second most abundant source population discovered by the Large Area Telescope (LAT) on board the Fermi Gamma-ray
Observing small-scale γ-ray anisotropies with the Cherenkov Telescope Array
Disentangling the composition of the diffuse γ-ray background (DGRB) is a major challenge in γ-ray astronomy. It is presumed that at the highest energies, the DGRB is dominated by relatively few,
Simulated Milky Way analogues: implications for dark matter indirect searches
We study high-resolution hydrodynamic simulations of Milky Way type galaxies obtained within the “Evolution and Assembly of GaLaxies and their Environments” (EAGLE) project, and identify those that
...
...

References

SHOWING 1-10 OF 37 REFERENCES
Gamma-ray background anisotropy from Galactic dark matter substructure
Dark matter annihilation in Galactic substructure will imprint characteristic angular signatures on the all-sky map of the diffuse gamma-ray background. We study the gamma-ray background anisotropy
Anisotropy probe of galactic and extra-galactic dark matter annihilations
We study the flux and the angular power spectrum of gamma rays produced by dark matter (DM) annihilations in the Milky Way (MW) and in extra-galactic halos. The annihilation signal receives
Constraints on the Galactic Halo Dark Matter from Fermi-LAT Diffuse Measurements
We have performed an analysis of the diffuse gamma-ray emission with the Fermi Large Area Telescope (LAT) in the Milky Way halo region, searching for a signal from dark matter annihilation or decay.
Constraints on the annihilation cross section of dark matter particles from anisotropies in the diffuse gamma-ray background measured with Fermi-LAT
Annihilation of dark matter particles in cosmological halos (including the halo of the Milky Way) contributes to the diffuse gamma-ray background (DGRB). As this contribution will appear anisotropic
Quantifying the heart of darkness with GHALO – a multibillion particle simulation of a galactic halo
We perform a series of simulations of a Galactic mass dark matter halo at different resolutions: our largest uses over 3 billion particles and has a mass resolution of 1000 M⊙. We quantify the
The inner structure of ΛCDM haloes – III. Universality and asymptotic slopes
We investigate the mass profile of cold dark matter (ACDM) haloes using a suite of numerical simulations spanning five decades in halo mass, from dwarf galaxies to rich galaxy clusters. These haloes
The Structure of cold dark matter halos
High resolution N-body simulations show that the density profiles of dark matter halos formed in the standard CDM cosmogony can be fit accurately by scaling a simple “universal” profile. Regardless
The sensitivity of Cherenkov telescopes to dark matter and astrophysical anisotropies in the diffuse gamma-ray background
In this article, the capability of present (H.E.S.S., MAGIC, VERITAS) and planned (CTA) ground-based Cherenkov telescope systems for detecting angular anisotropies in the diffuse gamma-ray background
OBSERVATIONS OF MILKY WAY DWARF SPHEROIDAL GALAXIES WITH THE FERMI-LARGE AREA TELESCOPE DETECTOR AND CONSTRAINTS ON DARK MATTER MODELS
We report on the observations of 14 dwarf spheroidal galaxies (dSphs) with the Fermi Gamma-Ray Space Telescope taken during the first 11 months of survey mode operations. The Fermi telescope, which
The Dark Matter Annihilation Signal from Galactic Substructure: Predictions for GLAST
We present quantitative predictions for the detectability of individual Galactic dark matter subhalos in gamma rays from dark matter pair annihilations in their centers. Our method is based on a
...
...