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About

Hartmut Winkler is a prominent astrophysicist whose research centers on the variability and structure of active galactic nuclei (AGN), with particular expertise in changing-look Seyfert galaxies and reverberation mapping techniques. His most impactful work focuses on NGC 1566, a nearby changing-look AGN that he has monitored extensively across optical, UV, and X-ray wavelengths using the Neil Gehrels Swift Observatory and the MASTER Global Robotic Network. His 2018 paper documenting a dramatic new changing-look event in NGC 1566 has garnered 88 citations, establishing it as a key reference in AGN variability research, with follow-up studies further illuminating the galaxy's post-outburst behavior. Winkler has been instrumental in advancing robotic reverberation mapping — a technique that probes the size and structure of black hole accretion discs by measuring light travel time delays across wavelengths. His contributions span several landmark AGN systems, including Arp 151, 3C 120, Mrk 876, and NGC 7469, leveraging global robotic telescope networks such as Las Cumbres Observatory. This methodological approach has helped constrain accretion disc physics and black hole masses with unprecedented temporal coverage, making Winkler a significant contributor to time-domain astronomy.