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Subject
- galaxies17
- markarian galaxies[remove]17
- bl lacertae objects4
- active galactic nuclei3
- catalogs3
- infrared sources3
- photometry3
- gamma-ray astronomy2
- infrared photometry2
- quasars2
- radio astronomy2
- radio galaxies2
- radio sources2
- seyfert galaxies2
- spectrophotometry2
- spectroscopy2
- apparent magnitude1
- astronomical models1
- galaxy classification systems1
- galaxy clusters1
