典型文献
B3 0749+460A:A New Repeat"Changing-look"Active Galactic Nucleus Associated with X-Ray Spectral Slope Variations
文献摘要：
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→ Sy1.8→ Sy1.9.In the transitions,the classical broad Hα emission fades away after 2013 and disappears in our 2021 spectrum,although the absence of broad Hβ can be traced back to at least 2016.A follow-up observation in X-rays by the Swift/XRT reveals that(l)the X-ray emission level gradually decreased 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 Hα 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.
文献关键词：
中图分类号：
作者姓名：
J.Wang;W.K.Zheng;D.W.Xu;T.G.Brink;A.V.Filippenko;C.Gao;S.S.Sun;J.Y.Wei
作者机构：
Guangxi Key Laboratory for Relativistic Astrophysics,School of Physical Science and Technology,Guangxi University,Nanning 530004,China;Key Laboratory of Space Astronomy and Technology,National Astronomical Observatories,Chinese Academy of Sciences,Beijing 100101,China;Department of Astronomy,University of California,Berkeley,CA 94720-3411,USA;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 100049,China;Miller Institute for Basic Research in Science,University of California,Berkeley,CA 94720,USA
文献出处：
引用格式：
[1]J.Wang;W.K.Zheng;D.W.Xu;T.G.Brink;A.V.Filippenko;C.Gao;S.S.Sun;J.Y.Wei-.B3 0749+460A:A New Repeat"Changing-look"Active Galactic Nucleus Associated with X-Ray Spectral Slope Variations)[J].天文和天体物理学研究,2022(01):114-125
A类：
0749+460A,MaNGA,Seyfert,Sy1,AGNs
B类：
B3,New,Repeat,Changing,look,Active,Galactic,Nucleus,Associated,Ray,Spectral,Slope,Variations,Here,we,report,identification,new,double,peaked,local,changing,active,galactic,nucleus,CL,terms,our,multi,epoch,spectroscopic,analysis,By,comparing,spectra,taken,ones,by,Sloan,Digital,Sky,Survey,BOSS,type,transitions,In,classical,broad,emission,fades,away,after,disappears,spectrum,although,absence,can,be,traced,back,least,follow,up,observation,rays,Swift,XRT,reveals,that,level,gradually,decreased,since,soft,optical,turn,off,state,hard,We,argue,disappearance,likely,explained,disk,wind,line,region,model,which,phenomenon,sensitive,luminosity,individual
AB值：
0.615124
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