Dynamical Modeling of the CIV Broad Line Region of the $z=2.805$ Multiply Imaged Quasar SDSS J2222+2745

Abstract

We present CIV BLR modeling results for the multiply imaged $z=2.805$ quasar SDSS J2222+2745. Using data covering a 5.3 year baseline after accounting for gravitational time delays, we find models that can reproduce the observed emission-line spectra and integrated CIV fluctuations. The models suggest a thick disk BLR that is inclined by $\sim$40 degrees to the observer's line of sight and with a emissivity weighted median radius of $r_{\mathrm{median}}=33.0_{-2.1}^{+2.4}$ light days. The kinematics are dominated by near-circular Keplerian motion with the remainder inflowing. The rest-frame lag one would measure from the models is ${\tau }_{\mathrm{median}}=36.4_{-1.8}^{+1.8}$ days, which is consistent with measurements based on cross-correlation. We show a possible geometry and transfer function based on the model fits and find that the model-produced velocity-resolved lags are consistent with those from cross-correlation. We measure a black hole mass of ${\log }_{10}(M_{\mathrm{BH}}/M_{\odot })=8.31_{-0.06}^{+0.07}$, which requires a scale factor of ${\log }_{10}(f_{\mathrm{mean},\sigma })=0.20_{-0.07}^{+0.09}$.

arXiv comment8 pages, 5 figures, submitted to ApJL

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