3 papers
astro-ph.GA2021
The first measurement of the quasar lifetime distribution
Ilya S. Khrykin, Joseph F. Hennawi, Gabor Worseck +1
Understanding the growth of the supermassive black holes powering luminous quasars, their co-evolution with host galaxies, and impact on the surrounding intergalactic medium depend…
astro-ph.GA2021
Dating individual quasars with the HeII proximity effect
Gábor Worseck, Ilya S. Khrykin, Joseph F. Hennawi +2
Constraints on the time-scales of quasar activity are key to understanding the formation and growth of supermassive black holes (SMBHs), quasar triggering mechanisms, and possible…
astro-ph.GA2018
Evidence for Short Myr Lifetimes from the He II Proximity Zones of Quasars
Ilya S. Khrykin, Joseph F. Hennawi, Gabor Worseck
The duration of quasar accretion episodes is a key quantity for distinguishing between models for the formation and growth of supermassive black holes, the evolution of quasars, an…