Investigating changing-look active galactic nuclei with long-term optical and X-ray observations

Open Access

Fig. 1.

Distribution of λ_Edd with the spectral states for each source. The horizontal dashed red lines in each panel represent the transition Eddington ratio ( $λ_{Edd}^{tr}$ $\lambda_{\mathrm{Edd}}^{\mathrm{tr}}$ ) for each source except NGC 2992. NGC 2992 did not show a transition between type 1 and type 1.8–2 states.

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