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- astrophysics - high energy astrophysical phenomena95
- astrophysics - astrophysics of galaxies62
- galaxies: seyfert50
- galaxies: active49
- astrophysics::high energy astrophysical phenomena37
- astrophysics::cosmology and extragalactic astrophysics36
- astrophysics35
- fos: physical sciences33
- x-rays: galaxies: clusters33