Visit ASIAA Homepage Registration Deadline: November 1, 2018 (Taiwan Time)
East-Asia AGN Workshop 2019
January 21(Mon)-23(Wed), 2019
ASIAA Auditorium, 1st Floor AS/NTU Astronomy-Mathematics Building

Poster Presentation

On the Origin of the Spectral Variability of WPVS 007

Author(s): Junyao Li (USTC) Mouyuan Sun (USTC) Tinggui Wang (USTC) Yongquan Xue (USTC)

Presenter: Junyao Li (USTC)

We report the discovery of large amplitude mid-infrared variability (MIR, ~0.3 mag) in the Wide-field Infrared Survey Explore W1 and W2 bands, and the time-scale dependent color variability in the low luminosity narrow-line Seyfert 1 galaxy WPVS 007, which exhibits prominent and varying outflows with maximum velocity ~13000 km/s. The MIR and color variability analyses suggest that the intrinsic luminosity variability should be responsible for the variable continuum flux and the ''bluer when brighter'' trend, rather than the change of extinction. Combining with the coordinated correlation between outflow velocity and bolometric luminosity, our results provide evidence that the outflows are most likely to be radiatively driven, and the variation of ionizing luminosity is in charge of the dramatic broad absorption line variability.
The correlation between C IV and Si IV absorption strength with luminosity can be explained by its low ionization state as traced by the weak N V line and X-ray faintness, at which the ion column densities decrease with decreasing luminosity. The outflow launch radius might be as small as 8e-4 pc in order to yield the maximum velocity in the observed time-scale and to prevent the velocity-luminosity relationship be smeared by the long acceleration time span.

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