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arXiv 2401.03046astro-ph.GAastro-ph.IM
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Changing-Look AGN Mrk 883的多历元光学光谱变率

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

Erika Benítez, Castalia Alenka Negrete, Héctor Ibarra-Medel, Irene Cruz-González, José Miguel Rodríguez-Espinosa

AI总结:

本研究利用多历元光学光谱观测发现Seyfert 1.9星系Mrk 883在约15年内转变为Seyfert 1.8,并提出极向电离驱动风可能解释其changing-look变率。

摘要:

本文展示了Seyfert 1.9星系Mrk 883的多历元光学光谱。数据来自Gran Telescopio Canarias望远镜及MEGARA积分场单元模式、SDSS-IV MaNGA Survey和SDSS-I Legacy Survey的存档数据,以及在San Pedro Mártir天文台获取的新光谱观测。我们报告了Hb发射线宽分量的出现,在MaNGA光谱中显示最大FWHM约为5927 ± 481 km/s,发现从Seyfert 1.9(2003年6月23日)转变为Seyfert 1.8(2018年5月18日)的证据。观测到的从Sy1.9到Sy1.8的changing-look变化时间尺度Δt约为15年。此外,我们观测到2018至2023年间宽发射线的轮廓和流量变率,以及[OIII]5007 Å的风分量,其最大FWHM为1758 ± 178 km/s,于2023年4月15日探测到。在所有历元中,宽线变率与光学连续谱发射脱钩,后者显示极少或无变化。这些结果表明,极向的电离驱动风可能是解释观测到的changing-look变化的可能情景。

英文摘要:

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 \emph{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 Mártir Observatory. We report the appearance of the broad component of Hb, emission line, showing a maximum FWHM $\sim$ 5927 $\pm$\, 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 $Δ$t\,$\sim$15~y. In~addition, we observe profile and flux broad emission line variability from 2018 to 2023, and a wind component in [OIII]5007~Å, with~a maximum FWHM = 1758 $\pm$ 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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