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- active galactic nuclei[remove]1,047
- galaxies301
- redshifted286
- x-ray sources283
- quasars259
- photometry248
- spectroscopy228
- radio astronomy227
- optical astronomy183
- surveys176
- radio sources147
- infrared photometry121
- infrared sources109
- bl lacertae objects100
- gamma-ray astronomy96
- radio galaxies87
- infrared astronomy79
- radio continuum emission74
- seyfert galaxies64
- line intensities53