B3 0749+460A: A New Repeat "Changing-Look" Active Galactic Nucleus Associated with X-Ray Spectral Slope Variations
Research in Astronomy and Astrophysics（2021）
关键词
galaxies,Seyfert,galaxies,nuclei,(galaxies,) quasars,emission lines,(galaxies,) quasars,individual (B3 0749+460A),X-rays,galaxies
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