MCMC fits to accretion disk SEDs of 23 high-z blazars give black hole masses of 10^8-10^10 solar masses and Eddington ratios 0.04-1, showing that ignoring IGM attenuation overestimates masses with larger bias at higher redshift.
C., Volonteri, M., & Rees, M
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Black-hole mass estimation through accretion disk spectral fitting for high-redshift blazars
MCMC fits to accretion disk SEDs of 23 high-z blazars give black hole masses of 10^8-10^10 solar masses and Eddington ratios 0.04-1, showing that ignoring IGM attenuation overestimates masses with larger bias at higher redshift.