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active galaxy markarian-421 (1) |
bl lacertae objects: individual (markarian 421) (1) |
correlated variability (1) |
energy (1) |
galactic nuclei (1) |
galaxies: active (1) |
gamma rays: observations (1) |
gamma-rays (1) |
magic telescope (1) |
radiation (1) |
radiation mechanisms: non-thermal (1) |
ray spectral variability (1) |
tev photons (1) |
x-rays: galaxies (1) |
xmm-newton (1) |