Type 1 active galactic nucleus fraction in the SDSS/FIRST survey

@article{Lu2010Type1A,
  title={Type 1 active galactic nucleus fraction in the SDSS/FIRST survey},
  author={Yu Lu and Ting-gui Wang and Xiao-bo Dong and Hongyan Zhou},
  journal={Monthly Notices of the Royal Astronomical Society},
  year={2010},
  volume={404},
  pages={1761-1774}
}
In the unification scheme, narrow-lined (type 2) active galactic nuclei (AGNs) are intrinsically similar to broad-lined (type 1) AGNs, with the exception that the line of sight to the broad emission-line region and accretion disc is blocked by a dusty torus. The fraction of type 1 AGNs measures the average covering factor of the torus. In this paper, we explore the dependence of this fraction on nuclear properties for a sample of low-redshift (z≤ 0.35) radio-strong (P1.4 GHz≥ 1023 W Hz−1) AGNs… 

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