Cosmological Evolution of the Duty Cycle of Quasars

Details Cosmological Evolution of the Duty Cycle of Quasars Cosmological Evolution of the Duty Cycle of Quasars

Oct 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..373..667c&link_type=abstract

The Central Engine of Active Galactic Nuclei, ASP Conference Series, Vol. 373, proceedings of the conference held 16-21 October,

Computer Science

Scientific paper

In this paper, we obtain quasar duty cycles based on analyses of a large sample composed of 10,979 quasars with redshifts z≤2.1 from the Sloan Digital Sky Survey (SDSS) Data Release Three. We estimate masses of quasar black holes and obtain their mass function (MF) of the present sample. We then get the duty cycle bar{δ}(z)≈ 10-3-1 based on the Soltan's argument, implying that black holes are undergoing multiple episodic activity. We find that the duty cycle has a strong evolution. By comparison, we show that evolution of the duty cycle follows the history of cosmic star formation rate (SFR) density in the Universe, providing intriguing evidence for a natural connection between star formation and triggering of black hole activity.

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