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Subject
- black holes[remove]28
- optical astronomy14
- active galactic nuclei12
- galaxies12
- redshifted12
- spectroscopy10
- photometry8
- quasars7
- x-ray sources6
- galaxy kinematics5
- seyfert galaxies5
- infrared photometry4
- x-ray binary stars4
- radio astronomy3
- radio sources3
- stellar masses3
- wide-band photometry3
- absolute magnitude2
- apparent magnitude2
- infrared astronomy2
