• Corpus ID: 18620735

QSO Lifetimes

  title={QSO Lifetimes},
  author={Paul Martini},
The QSO lifetimetQ is one of the most fundamental quantities for understanding black hole and QSO evolution, yet it remains uncertain by several order s of magnitude. IftQ is long, then only a small fraction of galaxies went through a luminou s QSO phase. In contrast, a short lifetime would require most galaxies today to have und ergone a QSO phase in their youth. The current best estimates or constraints on tQ from black hole demographics and the radiative properties of QSOs vary from at least… 

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