Tracking the state transitions in changing-look active galactic nuclei through their polarized-light echoes
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/201936123
Abstract: Context: Variations in the mass accretion rate appear to be responsible for the rapid transitions in spectral type that are observed in increasingly more active galactic nuclei (AGNs). These objects are now labeled "changing-look" AGNs… read more here.
Keywords: galactic nuclei; look; active galactic; polarized light ... See more keywords
A flare in the optical spotted in the changing-look Seyfert NGC 3516
Sign Up to like & getrecommendations! Published in 2020 at "Astronomy and Astrophysics"
DOI: 10.1051/0004-6361/202037532
Abstract: We present observations from the short-term intensive optical campaign (from Sep2019 to Jan2020) of the changing-look Seyfert NGC 3516. This active galactic nucleus is known to have strong optical variability and has changed its type… read more here.
Keywords: seyfert ngc; ngc 3516; changing look; look seyfert ... See more keywords
Accretion and Host-Galaxy Properties of 14 New “Changing-Look” Active Galactic Nuclei Identified from the SDSS-V Survey
Sign Up to like & getrecommendations! Published in 2022 at "Research in Astronomy and Astrophysics"
DOI: 10.1088/1674-4527/ac995c
Abstract: The widely accepted active galactic nucleus (AGN) paradigm has been recently challenged by the discovery of the so-called ``changing-look'' (CL) phenomenon characterized by spectral-type transitions. By comparing the SDSS-V and SDSS DR16 spectroscopic datasets, here… read more here.
Keywords: active galactic; galaxy; accretion host; changing look ... See more keywords
Changing look active galactic nuclei in the MaNGA survey
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DOI: 10.1093/mnras/staa1939
Abstract: Changing look active galactic nuclei (CLAGNs) are rare cases of AGNs, where the continuum flux increases/decreases and the broad emission lines appear/disappear within short time-scales. These extreme changes challenge our understanding of accretion disc dynamics.… read more here.
Keywords: look active; galactic nuclei; active galactic; changing look ... See more keywords
Four changing-look active galactic nuclei found from optical variations
Sign Up to like & getrecommendations! Published in 2024 at "Monthly Notices of the Royal Astronomical Society"
DOI: 10.1093/mnras/stae1044
Abstract: We report the finding of four changing-look (CL) active galactic nuclei (AGN). We selected these sources due to their potential as interesting targets when considering their relatively-large optical flux variations and related mid-infrared flux variations.… read more here.
Keywords: four changing; active galactic; changing look; look active ... See more keywords
New changing look case in NGC 1566
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DOI: 10.1093/mnras/sty3133
Abstract: We present a study of optical, UV and X-ray light curves of the nearby changing look active galactic nucleus in the galaxy NGC 1566 obtained with the Neil Gehrels Swift Observatory and the MASTER Global… read more here.
Keywords: new changing; changing look; ngc 1566; look case ... See more keywords
Multi-Epoch Optical Spectroscopy Variability of the Changing-Look AGN Mrk 883
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DOI: 10.3390/universe10010021
Abstract: In this work, we present multi-epoch optical spectra of the Seyfert 1.9 galaxy Mrk 883. Data were obtained with the Gran Telescopio Canarias and the MEGARA Integral Field Unit mode, archival data from the SDSS-IV… read more here.
Keywords: epoch optical; spectroscopy; variability; multi epoch ... See more keywords