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Subject
- active galactic nuclei3
- apparent magnitude1
- astronomical models1
- bl lacertae objects4
- catalogs3
- galaxies17
- galaxy classification systems1
- galaxy clusters1
- gamma-ray astronomy2
- h i line emission1
- h ii regions1
- infrared photometry2
- infrared sources3
- line intensities1
- markarian galaxies[remove]17
- optical astronomy1
- photographic magnitude1
- photometry3
- quasars2
- radial velocity1
