A Physical Model for the Origin of Quasar Lifetimes

@article{Hopkins2005APM,
  title={A Physical Model for the Origin of Quasar Lifetimes},
  author={Philip F. Hopkins and Lars E. Hernquist and Paul Martini and Thomas J. Cox and Brant E. Robertson and Tiziana Di Matteo and Volker Springel},
  journal={The Astrophysical Journal Letters},
  year={2005},
  volume={625},
  pages={L71 - L74}
}
We propose a model of quasar lifetimes in which longer periods of rapid black hole accretion are distinguished from observationally inferred lifetimes of quasars owing to gas and dust obscuration. In our picture, quasars are powered by gas funneled to galaxy centers, fueling starbursts and feeding black hole growth, but are "buried" until feedback from the accretion disperses the obscuring material, creating a window in which the black hole is observable as an optical quasar. Eventually, the… 
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