The spatial distribution of dark-matter-annihilation originated gamma-ray line signal
arXiv:1312.0357 · doi:10.1088/1674-4527/14/5/002
Abstract
The GeVTeV ray line signal is the smoking gun signature of the dark matter annihilation or decay. The detection of such a signal is one of the main targets of some space-based telescopes, including Fermi-LAT and the upcoming CALET, DAMPE and Gamma-400. An important feature of the dark-matter-annihilation originated ray line photons is their concentration at the center of the Galaxy. So far no reliable ray line has been detected by Fermi-LAT and the upper limits on the cross section of annihilation into rays have been reported. We use these upper limits to estimate the "maximal" number of ray line photons detectable for Fermi-LAT, DAMPE and Gamma-400 and then investigate the spatial distribution of these photons. We show that usually the center of the distribution region will be offset from the Galactic centre (Sgr A) due to the limited statistics. Such a result is almost independent of the dark matter distribution models and renders the reconstruction of the dark matter distribution with the ray line signal very challenging for the foreseeable space-based detectors.
Typos corrected
References in corpus (8)
- A Tentative Gamma-Ray Line from Dark Matter Annihilation at the Fermi Large Area Telescope
- Dark Matter and Collider Phenomenology of Universal Extra Dimensions
- Search for Gamma-ray Spectral Lines with the Fermi Large Area Telescope and Dark Matter Implications
- Gamma Ray Signals from Dark Matter: Concepts, Status and Prospects
- Fermi 130 GeV gamma-ray excess and dark matter annihilation in sub-haloes and in the Galactic centre
- Statistical interpretation of the spatial distribution of current 130 GeV gamma-ray line signal within the dark matter annihilation scenario
- Testing the 130 GeV gamma-ray line with high energy resolution detectors
- Constraining the distribution of dark matter in inner galaxy with indirect detection signal: The case of tentative 130 gev γ-ray line