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08 February 2025
 
  » arxiv » astro-ph/0112131

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What does the local black hole mass distribution tell us about the evolution of the quasar luminosity function?
Luca Ciotti ; Zoltan Haiman ; Jeremiah P. Ostriker ;
Date 6 Dec 2001
Subject astro-ph
AbstractWe present a robust method to derive the duty cycle of QSO activity based on the empirical QSO luminosity function and on the present-day linear relation between the masses of supermassive black holes and those of their spheroidal host stellar systems. It is found that the duty cycle is substantially less than unity, with characteristic values in the range $3-6 imes 10^{-3}$. Finally, we tested the expectation that the QSO luminosity evolution and the star formation history should be roughly parallel, as a consequence of the above--mentioned relation between BH and galaxy masses.
Source arXiv, astro-ph/0112131
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