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Subject
- galaxies180
- seyfert galaxies[remove]180
- active galactic nuclei64
- spectroscopy55
- photometry50
- optical astronomy39
- x-ray sources34
- redshifted28
- quasars25
- infrared photometry24
- radio astronomy21
- wide-band photometry21
- infrared sources16
- surveys14
- infrared astronomy13
- radio galaxies13
- line intensities10
- radio sources7
- black holes5
- catalogs5
