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Galaxies: active (2) |
Radiation mechanisms: nonthermal (2) |
BL Lacertae objects: individual (Markarian 421) (1) |
Galaxies: jets (1) |
Gamma rays: galaxies (1) |
Gamma-rays: general (1) |
Polarization (1) |
Relativistic processes (1) |
X-rays: galaxies (1) |