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- W3209703004 abstract "Here we report an identification of B3,0749+460A as a new double-peaked local changing-look active galactic nucleus (CL-AGN) in terms of our multi-epoch spectroscopic analysis. By comparing our new spectra taken in 2021 with the ones taken by the Sloan Digital Sky Survey in 2004, BOSS in 2013, and MaNGA in 2016, we reveal type transitions of Seyfert (Sy) 1.9$rightarrow$Sy1.8$rightarrow$Sy1.9. In the transitions, the classical broad H$alpha$ emission fades away since 2013, and disappears in our 2021 spectrum, although the absence of broad H$beta$ can be traced back to at least 2016. A follow-up observation in X-rays by the {it Swift}/XRT reveals that (1) the X-ray emission level gradually decreases since 2005; and (2) the X-ray spectrum is soft in the optical turn-off state and hard in the turn-on state. We argue that the disappearance of the classical broad H$alpha$ emission can be likely explained by the disk-wind broad-line-region model, in which the CL phenomenon is sensitive to luminosity in individual AGNs." @default.
- W3209703004 created "2021-11-08" @default.
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- W3209703004 date "2021-10-23" @default.
- W3209703004 modified "2023-10-16" @default.
- W3209703004 title "B3,0749+460A: A New Changing-Look Active Galactic Nucleus Associated with X-ray Spectral Slope Variations" @default.
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