Multi-Epoch Optical Spectroscopy Variability of the Changing-Look AGN Mrk 883

UNIVERSE(2024)

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摘要
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 MaNGA Survey and the SDSS-I Legacy Survey, and new spectroscopic observations obtained at San Pedro Martir Observatory. We report the appearance of the broad component of H beta emission line, showing a maximum FWHM similar to 5927 +/- 481 km s(-1) in the MaNGA spectra, finding evidence for a change from Seyfert 1.9 (23 June 2003) to Seyfert 1.8 (18 May 2018). The observed changing-look variation from Sy1.9 to Sy1.8 has a timescale Delta t similar to 15 y. In addition, we observe profile and flux broad emission line variability from 2018 to 2023, and a wind component in [OIII]5007 angstrom, with a maximum FWHM = 1758 +/- 178 km s(-1), detected on 15 April 2023. In all epochs, variability of the broad lines was found to be disconnected from the optical continuum emission, which shows little or no variations. These results suggest that an ionized-driven wind in the polar direction could be a possible scenario to explain the observed changing-look variations.
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关键词
active galactic nuclei,Seyfert galaxies: variability,optical spectroscopy,AGN winds
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