activity
20192025
most citedBlack hole mass estimates in quasars - A comparative analysis of high- and low-ionization lines

40 citations · 43 across the 4 of their papers we have counts for

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astro-ph.HE2024★ 3 cited

The extremes of AGN variability: outbursts, deep fades, changing looks, exceptional spectral states, and semi-periodicities

S. Komossa, D. Grupe, P. Marziani +16

The extremes of Active Galactic Nuclei (AGN) variability offer valuable new insights into the drivers and physics of AGN. We discuss some of the most extreme cases of AGN variabili…