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Identifying Transitions in Changing-look Active Galactic Nuclei in Light-curve Data with the Zwicky Transient Facility

  • Authors: Margaret E. Verrico, K. Decker French, Vivienne F. Baldassare, Colin J. Burke, Laura Duffy, Nicholas Earl, Megan Harrison, Jason T. Hinkle, Alexander Messick, Samaresh Mondal, Yashasvi Moon, Margaret Shepherd, Zachary Stone

Margaret E. Verrico et al 2026 The Astrophysical Journal 1004 .

  • Provider: AAS Journals

Caption: Figure 5.

Transition properties across the CL-AGN, Seyfert 1, and Seyfert 2 samples (contours), as well as for individual CL-AGN transition candidates (markers). Left: amplitude of the transition versus its duration. CL-AGN transition candidates have a higher variability amplitude than other AGN variability and have transition durations of a few hundred days. Center: magnitude of the g-band transition versus magnitude of the g − r color transition. Our adopted threshold of ∣Δg∣ > 0.4 mag and ∣Δ(g − r)∣ > 0.2 mag (red dashed line) captures only the most extreme AGN variability. Right: change in g-band versus g − r color. We find three candidate turn-on events (Δg, Δ(g − r) < 0) and five candidate turn-off events (Δg, Δ(g − r) > 0).

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