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Do Anomalous Narrow Line Quasars Cast Doubt on Virial Mass Estimation?
Charles L. Steinhardt, John D. Silverman
Anomalous Narrow-Line Quasars (ANLs) are a population of quasars with narrow Hβ, and sometimes [O III] broader than ~1000 km/s, in total comprising \sim 10-30% (most likely ~25%) o…
Quasars with Anomalous Hβ Profiles I: Demographics
Charles L. Steinhardt, John D. Silverman
The Hβ emission line in a typical Type I quasar is composed of a broad base and a narrow core, with the core velocity typical of narrow-line region emission, and line-fitting routi…
Effects of Biases in Virial Mass Estimation on Cosmic Synchronization of Quasar Accretion
Charles L. Steinhardt
Recent work using virial mass estimates and the quasar mass-luminosity plane has yielded several new puzzles regarding quasar accretion, including a sub-Eddington boundary on most…
Evolutionary Tracks of Individual Quasars in the Mass-Luminosity Plane
Charles L. Steinhardt, Martin Elvis, Mihail Amarie
Previous work on the quasar mass-luminosity plane indicates the possibility that quasars of the same central black hole mass might follow a common evolutionary track, independent o…