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Reverberation Mapping of Two Luminous Quasars: the Broad-line Region Structure and Black Hole Mass
Sha-Sha Li, Sen Yang, Zi-Xu Yang, Yong-Jie Chen, Yu-Yang Songsheng, He-Zhen Liu, Pu Du, Bin Luo, Zhe Yu, Chen Hu, Bo-Wei Jiang, Dong-Wei Bao, Wei-Jian Guo, Zhi-Xiang Zhang, Yan-Rong Li, Ming Xiao, Kai-Xing Lu, Luis C. Ho, Jing-Min Bai, Wei-Hao Bian, Jesús Aceituno, Takeo Minezaki, Mitsuru Kokubo, Jian-Min Wang
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We report the results of a multi-year spectroscopic and photometric monitoring campaign of two luminous quasars, PG~0923+201 and PG~1001+291, both located at the high-luminosity end of the broad-line region (BLR) size-luminosity relation with optical luminosities above 10⁴⁵ erg s⁻¹. PG~0923+201 is for the first time monitored, and PG~1001+291 was previously monitored but our campaign has a much longer temporal baseline. We detect time lags of variations of the broad Hβ, Hγ, Fe {\sc ii} lines with respect to those of the 5100~{\AA} continuum. The velocity-resolved delay map of Hβ in PG~0923+201 indicates a complicated structure with a mix of Keplerian disk-like motion and outflow, and the map of Hβ in PG~1001+291 shows a signature of Keplerian disk-like motion. Assuming a virial factor of f_(BLR)=1 and FWHM line widths, we measure the black hole mass to be 118₋₁₆⁺¹¹×10⁷ M_⊙ for PG~0923+201 and 3.33_(-0.54)^(+0.62)×10⁷ M_⊙ for PG~1001+291. Their respective accretion rates are estimated to be 0.21_(-0.07)^(+0.06) ×L_(Edd) c⁻² and 679₋₂₂₇⁺²⁵⁹×L_(Edd) c⁻², indicating that PG~0923+201 is a sub-Eddington accretor and PG~1001+291 is a super-Eddington accretor. While the Hβ time lag of PG~0923+201 agrees with the size-luminosity relation, the time lag of PG~1001+291 shows a significant deviation, confirming that in high-luminosity AGN the BLR size depends on both luminosity and Eddington ratio. Black hole mass estimates from single AGN spectra will be over-estimated at high luminosities and redshifts if this effect is not taken into account.
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