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Subject
- bl lacertae objects[remove]296
- photometry111
- quasars111
- active galactic nuclei100
- radio astronomy87
- gamma-ray astronomy81
- optical astronomy77
- infrared photometry69
- radio sources66
- redshifted57
- x-ray sources56
- wide-band photometry43
- galaxies30
- polarimetry26
- radio continuum emission24
- radio galaxies18
- surveys18
- spectroscopy15
- astronomical object identification11
- ccd photometry10