Image Details
Caption: Figure 3.
Schematic picture of the dust echo model. The central SMBH and dusty torus are shown in purple and red, respectively. The dashed parabolas illustrate the isodelay surface at lags of 400, 800, 1200, 1600, and 2000 days, respectively.
© 2025. The Author(s). Published by the American Astronomical Society.