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Title: Investigating gamma-ray lines from dark matter with future observatories

Abstract

We study the prospects for studying line features in gamma-ray spectra with upcoming gamma-ray experiments, such as HESS-II, the Cherenkov Telescope Array (CTA), and the GAMMA-400 satellite. As an example we use the narrow feature at 130 GeV seen in public data from the Fermi-LAT satellite. We found that all three experiments should be able to confidently confirm or rule out the presence of this 130 GeV feature. If it is real, it should be confirmed with a confidence level higher than 5σ. Assuming it to be a spectral signature of dark matter origin, GAMMA-400, thanks to a projected energy resolution of about 1.5 % at 100 GeV, should also be able to resolve both the γγ line and a corresponding Zγ or Hγ feature, if the corresponding branching ratio is comparable to that into two photons. It will also allow to distinguish between a gamma-ray line and the similar feature resulting from internal bremsstrahlung photons.

Authors:
; ;  [1];  [2];  [3]
  1. The Oskar Klein Centre for Cosmoparticle Physics, Department of Physics, Stockholm University, AlbaNova, SE-106 91 Stockholm (Sweden)
  2. GRAPPA Institute, University of Amsterdam, Science Park 904, 1090 GL Amsterdam (Netherlands)
  3. Max-Planck-Institut für Physik, Föhringer Ring 6, 80805 München (Germany)
Publication Date:
OSTI Identifier:
22279781
Resource Type:
Journal Article
Journal Name:
Journal of Cosmology and Astroparticle Physics
Additional Journal Information:
Journal Volume: 2012; Journal Issue: 11; Other Information: Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 1475-7516
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTROPHYSICS; BRANCHING RATIO; COMPARATIVE EVALUATIONS; COSMOLOGY; ENERGY RESOLUTION; GAMMA RADIATION; GAMMA SPECTRA; GEV RANGE; INTERNAL BREMSSTRAHLUNG; NONLUMINOUS MATTER; PHOTONS; TELESCOPES

Citation Formats

Bergström, Lars, Conrad, Jan, Farnier, Christian, Bertone, Gianfranco, and Weniger, Christoph, E-mail: lbe@fysik.su.se, E-mail: gf.bertone@gmail.com, E-mail: conrad@fysik.su.se, E-mail: Christian.Farnier@fysik.su.se, E-mail: weniger@mpp.mpg.de. Investigating gamma-ray lines from dark matter with future observatories. United States: N. p., 2012. Web. doi:10.1088/1475-7516/2012/11/025.
Bergström, Lars, Conrad, Jan, Farnier, Christian, Bertone, Gianfranco, & Weniger, Christoph, E-mail: lbe@fysik.su.se, E-mail: gf.bertone@gmail.com, E-mail: conrad@fysik.su.se, E-mail: Christian.Farnier@fysik.su.se, E-mail: weniger@mpp.mpg.de. Investigating gamma-ray lines from dark matter with future observatories. United States. doi:10.1088/1475-7516/2012/11/025.
Bergström, Lars, Conrad, Jan, Farnier, Christian, Bertone, Gianfranco, and Weniger, Christoph, E-mail: lbe@fysik.su.se, E-mail: gf.bertone@gmail.com, E-mail: conrad@fysik.su.se, E-mail: Christian.Farnier@fysik.su.se, E-mail: weniger@mpp.mpg.de. Thu . "Investigating gamma-ray lines from dark matter with future observatories". United States. doi:10.1088/1475-7516/2012/11/025.
@article{osti_22279781,
title = {Investigating gamma-ray lines from dark matter with future observatories},
author = {Bergström, Lars and Conrad, Jan and Farnier, Christian and Bertone, Gianfranco and Weniger, Christoph, E-mail: lbe@fysik.su.se, E-mail: gf.bertone@gmail.com, E-mail: conrad@fysik.su.se, E-mail: Christian.Farnier@fysik.su.se, E-mail: weniger@mpp.mpg.de},
abstractNote = {We study the prospects for studying line features in gamma-ray spectra with upcoming gamma-ray experiments, such as HESS-II, the Cherenkov Telescope Array (CTA), and the GAMMA-400 satellite. As an example we use the narrow feature at 130 GeV seen in public data from the Fermi-LAT satellite. We found that all three experiments should be able to confidently confirm or rule out the presence of this 130 GeV feature. If it is real, it should be confirmed with a confidence level higher than 5σ. Assuming it to be a spectral signature of dark matter origin, GAMMA-400, thanks to a projected energy resolution of about 1.5 % at 100 GeV, should also be able to resolve both the γγ line and a corresponding Zγ or Hγ feature, if the corresponding branching ratio is comparable to that into two photons. It will also allow to distinguish between a gamma-ray line and the similar feature resulting from internal bremsstrahlung photons.},
doi = {10.1088/1475-7516/2012/11/025},
journal = {Journal of Cosmology and Astroparticle Physics},
issn = {1475-7516},
number = 11,
volume = 2012,
place = {United States},
year = {2012},
month = {11}
}