17-24 July 2013
KTH and Stockholm University Campus
Europe/Stockholm timezone

Impact of axion-like particles on observations with IACTs

18 Jul 2013, 15:45
D2 (KTH Campus)


KTH Campus

Talk presentation Astroparticle Physics Astroparticle Physics


Manuel Meyer (University of Hamburg)


Very high energy (VHE) gamma-rays undergo pair production with low energy photons of background radiation fields. This leads to an attenuation of the primary gamma-ray flux of extragalactic sources in the interaction with the extragalactic background light which stretches from ultraviolet to far-infrared wavelengths. In the presence of magnetic fields, gamma-rays could oscillate into hypothetical axion-like particles (ALPs). This might lead to a reduced opacity of the Universe for VHE gamma-rays, as ALPs circumvent pair production. Here, the impact of photon-ALP conversions on blazar spectra in different magnetic-field configurations is presented. Possible photon-ALP couplings are derived if evidences of a low opacity of the Universe for VHE gamma-rays are interpreted within ALP scenarios.

Primary author

Manuel Meyer (University of Hamburg)


Prof. Dieter Horns (Institut für Experimentalphysik, Univeristy of Hamburg)

Presentation Materials