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We have modeled the full velocity-resolved reverberation response of the H$beta$ and He II optical broad emission lines in NGC 3783 to constrain the geometry and kinematics of the low-ionization and high-ionization broad line region. The geometry is found to be a thick disk that is nearly face on, inclined at $sim 18^{circ}$ to our line of sight, and exhibiting clear ionization stratification, with an extended H$beta$-emitting region ($r_{rm median}=10.07^{+1.10}_{-1.12}$ light days) and a more compact and centrally-located He II-emitting region ($r_{rm median}=1.33^{+0.34}_{-0.42}$ light days). In the H$beta$-emitting region, the kinematics are dominated by near-circular Keplerian orbits, but with $sim 40$% of the orbits inflowing. The more compact He II-emitting region, on the other hand, appears to be dominated by outflowing orbits. The black hole mass is constrained to be $M_{rm BH}=2.82^{+1.55}_{-0.63}times10^7$ $M_{odot}$, which is consistent with the simple reverberation constraint on the mass based on a mean time delay, line width, and scale factor of $langle f rangle=4.82$. The difference in kinematics between the H$beta$- and He II-emitting regions of the BLR is intriguing given the recent history of large changes in the ionizing luminosity of NGC 3783 and evidence for possible changes in the BLR structure as a result.
A detailed analysis of the data from a high sampling rate, multi-month reverberation mapping campaign, undertaken primarily at MDM Observatory with supporting observations from telescopes around the world, reveals that the Hbeta emission region withi
NGC 2617 has attracted a lot of attention after the detection of the changes in spectral type, and its geometry and kinematics of broad-line region (BLR) are still ambiguous. In this paper, we present the high cadence ($sim$ 2 days) reverberation map
We present geometric and dynamical modeling of the broad line region for the multi-wavelength reverberation mapping campaign focused on NGC 5548 in 2014. The dataset includes photometric and spectroscopic monitoring in the optical and ultraviolet, co
Despite many decades of study, the kinematics of the broad-line region of 3C~273 are still poorly understood. We report a new, high signal-to-noise, reverberation mapping campaign carried out from November 2008 to March 2018 that allows the determina
The combination of the linear size from reverberation mapping (RM) and the angular distance of the broad line region (BLR) from spectroastrometry (SA) in active galactic nuclei (AGNs) can be used to measure the Hubble constant $H_0$. Recently, Wang e