The luminosity dependence of the type 1 active galactic nucleus fraction

@article{Simpson2005TheLD,
  title={The luminosity dependence of the type 1 active galactic nucleus fraction},
  author={Chris Simpson},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2005},
  volume={360},
  pages={565-572}
}
  • C. Simpson
  • Published 23 March 2005
  • Physics
  • Monthly Notices of the Royal Astronomical Society
Using a complete, magnitude-limited sample of active galaxies from the Sloan Digital Sky Survey, we show that the fraction of broad-line (type 1) active galactic nuclei (AGNs) increases with luminosity of the isotropically emitted [O III] narrow emission line. Our results are quantitatively in agreement with, and far less uncertain than, similar trends found from studies of X-ray and radio-selected active galaxies. While the correlation between broad-line fraction and luminosity is… 

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References

SHOWING 1-10 OF 62 REFERENCES
THE CLUSTERING OF ACTIVE GALACTIC NUCLEI IN THE SLOAN DIGITAL SKY SURVEY
We present the two-point correlation function (2PCF) of narrow-line active galactic nuclei (AGNs) selected within the First Data Release of the Sloan Digital Sky Survey. Using a sample of 13,605 AGNs
The host galaxies of active galactic nuclei
We examine the properties of the host galaxies of 22 623 narrow-line active galactic nuclei (AGN) with 0.02 < z < 0.3 selected from a complete sample of 122 808 galaxies from the Sloan Digital Sky
The Host Galaxies of AGN
We examine the properties of the host galaxies of 22,623 narrow-line AGN with 0.02<z<0.3 selected from a complete sample of 122,808 galaxies from the Sloan Digital Sky Survey. We focus on the
The Changing Active Galactic Nucleus Population
We investigate how the fraction of broad-line sources in the active galactic nucleus (AGN) population changes with X-ray luminosity and redshift. We first construct the rest-frame hard-energy (2-8
A physical model for the hard X-ray background
We combine a semi-analytic galaxy formation model with a prescription for the obscured growth of massive black holes, to reproduce the hard X-ray background (XRB), the local 2–10 keV active galactic
The Quasar Fraction in Low-Frequency Selected Complete Samples and Implications for Unified Schemes
Low-frequency radio surveys are ideal for selecting orientation-independent samples of extragalactic sources because the sample members are selected by virtue of their isotropic steep-spectrum
THE DISTRIBUTION OF ABSORBING COLUMN DENSITIES AMONG SEYFERT 2 GALAXIES
We use hard X-ray data for an "optimal" sample of Seyfert 2 galaxies to derive the distribution of the gaseous absorbing column densities among obscured active nuclei in the local universe. Of all
What Shapes the Luminosity Function of Galaxies
We investigate the physical mechanisms that shape the luminosity function of galaxies in hierarchical clustering models. Beginning with the mass function of dark matter halos in the ΛCDM (Λ cold dark
Cosmological Evolution of the Hard X-Ray Active Galactic Nucleus Luminosity Function and the Origin of the Hard X-Ray Background
We investigate the cosmological evolution of the hard X-ray luminosity function (HXLF) of active galactic nuclei (AGNs) in the 2-10 keV luminosity range of 1041.5-1046.5 ergs s-1 as a function of
The evolutionary sequence of active galactic nuclei and galaxy formation revealed
Today, almost every galaxy spheroid contains a massive black hole: a remnant of, and testament to, a period in its evolution when it contained an active galactic nucleus (AGN). However, the sequence
...
1
2
3
4
5
...