IAR   05382
INSTITUTO ARGENTINO DE RADIOASTRONOMIA
Unidad Ejecutora - UE
artículos
Título:
Search for Photon-Linelike Signatures from Dark Matter Annihilations with H.E.S.S.
Autor/es:
H.E.S.S. COLLABORATION; MEDINA, M. C.
Revista:
PHYSICAL REVIEW LETTERS
Editorial:
AMER PHYSICAL SOC
Referencias:
Lugar: New York; Año: 2013 vol. 110 p. 41301 - 41307
ISSN:
0031-9007
Resumen:
Gamma-ray line signatures can be expected in the very-high-energy (Eγ>100   GeV) domain due to self-annihilation or decay of dark matter (DM) particles in space. Such a signal would be readily distinguishable from astrophysical γ-ray sources that in most cases produce continuous spectra that span over several orders of magnitude in energy. Using data collected with the H.E.S.S. γ-ray instrument, upper limits on linelike emission are obtained in the energy range between ∼500  GeV and ∼25  TeV for the central part of the Milky Way halo and for extragalactic observations, complementing recent limits obtained with the Fermi-LAT instrument at lower energies. No statistically significant signal could be found. For monochromatic γ-ray line emission, flux limits of (2×10-7–2×10-5)  m-2 s-1 sr-1 and (1×10-8–2×10-6)  m-2 s-1 sr-1 are obtained for the central part of the Milky Way halo and extragalactic observations, respectively. For a DM particle mass of 1 TeV, limits on the velocity-averaged DM annihilation cross section ⟨σv⟩χχ→γγ reach ∼10-27  cm3 s-1, based on the Einasto parametrization of the Galactic DM halo density profile.