Talk Title: Calibrating the Black-Hole -- Halo Mass Relation from the Clustering of Quasars
Abstract: The relationship between the mass of a black-hole and the circular velocity of its host dark-matter halo is fundamental to the clustering length of quasars. The clustering length observed in the 2dF quasar redshift survey is consistent with the black-hole--halo relation observed in local galaxies, provided that quasars shine near their Eddington luminosity. The slow evolution of the clustering length with redshift inferred in the 2dF quasar redshift survey strongly favors a scenario where the central black-holes comprise a larger fraction of the host galaxy mass at higher redshifts. In a scenario where quasars are triggered by halo mergers, this scaling, in combination with observed number counts imply that quasars have an episodic lifetime that is set by the dynamical time of a galactic disk rather than by the Salpeter time.
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