Spectral Variability of the 3C 390.3 Nucleus for More Than 20 Years – II. Variability of the Broad Emission-Line Profiles and He Ii Λ4686 Å Emission-Line Fluxes
Monthly Notices of the Royal Astronomical Society（2020）
关键词
galaxies: active,galaxies: nuclei,quasars: emission lines,quasars: individual: 3C 390.3,galaxies: Seyfert
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