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About

Sergey S. Tsygankov is a leading astrophysicist specializing in the multiwavelength variability of active galactic nuclei (AGN), with a particular focus on the enigmatic class of "changing-look" AGN—objects that dramatically shift between spectral states on human timescales. His major contributions center on long-term, high-cadence monitoring campaigns that combine X-ray, UV, and optical data from the Neil Gehrels Swift Observatory with ground-based robotic networks like MASTER. Tsygankov’s seminal 2018 study of NGC 1566 (88 citations) provided the first comprehensive characterization of a changing-look event in this nearby Seyfert galaxy, revealing correlated flux and spectral changes across the electromagnetic spectrum. He subsequently extended this work in 2020 (26 citations) to track the post-maximum behavior, and in 2023 (11 citations) led a reverberation mapping campaign of NGC 2617, probing the geometry and physics of the broad-line region during a state transition. His discoveries have reshaped our understanding of accretion disk instabilities and the triggering mechanisms behind AGN state changes. Tsygankov’s work is foundational for time-domain astronomy, demonstrating how coordinated multiwavelength monitoring can unlock the inner workings of supermassive black holes.