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Subject
- active galactic nuclei[remove]1,052
- galaxies305
- redshifted291
- x-ray sources286
- quasars259
- photometry252
- spectroscopy229
- radio astronomy226
- optical astronomy184
- surveys177
- radio sources146
- infrared photometry125
- infrared sources111
- bl lacertae objects100
- gamma-ray astronomy97
- radio galaxies87
- infrared astronomy80
- radio continuum emission74
- seyfert galaxies64
- line intensities55
