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Yuan Liu, Shuang Nan Zhang, Xiao Ling Zhang, Relativistic Effects on the Observed AGN Luminosity Distribution, Publications of the Astronomical Society of Japan, Volume 59, Issue 1, 25 February 2007, Pages 185–188, https://doi.org/10.1093/pasj/59.1.185
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Abstract
Recently, Zhang (2005 ApJ, 618, L79) has proposed a model to account for the well-established effect that the fraction of type-II AGNs is anti-correlated with the observed X-ray luminosity; the model consists of an X-ray emitting accretion disk coaligned to the dusty torus within the standard AGN unification model. In this paper the model is refined by including relativistic effects of the observed X-ray radiation from the vicinity of the supermassive black hole in an AGN. The relativistic corrections improve the combined fitting results of the observed luminosity distribution and the type-II AGN fraction, though the improvement is not significant. The type-II AGN fraction prefers non–or mildly spinning black hole cases, and rules out the extremely spinning case.