scholarly journals A Detailed View of the Broad-line Region in NGC 3783 from Velocity-resolved Reverberation Mapping

2021 ◽  
Vol 920 (2) ◽  
pp. 112
Author(s):  
Misty C. Bentz ◽  
Peter R. Williams ◽  
Rachel Street ◽  
Christopher A. Onken ◽  
Monica Valluri ◽  
...  
Keyword(s):  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region

scholarly journals Reverberation Mapping and Broad-Line Region Models

1997 ◽  
Vol 159 ◽  
pp. 138-145
Author(s):  
D. Maoz
Keyword(s):  
Broad Line ◽  
Future Directions ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Mapping Point

AbstractI review what we have learned about the BLR from reverberation mapping, point to some problems and complications that have emerged, and outline some future directions.

A Photoionization Method for Estimating Black Hole Masses in Quasars

2018 ◽  
Vol 14 (S342) ◽  
pp. 270-271
Author(s):  
C. Alenka Negrete ◽  
Deborah Dultzin ◽  
Paola Marziani ◽  
Jack W. Sulentic ◽  
M. L. Martínez-Aldama
Keyword(s):  
Black Hole ◽  
High Redshift ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Physical Conditions ◽  
Broad Line Region ◽  
Supermassive Black Hole ◽  
Line Region ◽  
Black Hole Masses

AbstractWe present a method that uses photoionization codes (CLOUDY) to estimate the supermassive black hole masses (MBH) for quasars at low and high redshift. This method is based on the determination of the physical conditions of the broad line region (BLR) using observational diagnostic diagrams from line ratios in the UV. We also considered that the density and metallicity of the BLR in quasars at high z could be different from those at the nearby Universe. The computed black hole masses obtained using this method are in agreement with those derived from the method of reverberation mapping.

scholarly journals Testing broad-line region models with reverberation mapping

2020 ◽  
Vol 494 (2) ◽  
pp. 1611-1621 ◽  
Author(s):  
Hagai Netzer
Keyword(s):  
Time Lag ◽  
Galactic Nuclei ◽  
Balmer Line ◽  
Broad Line ◽  
Escape Probability ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
High Metallicity ◽  
Good Agreement

ABSTRACT New reverberation mapping (RM) measurements, combined with accurate luminosities and line ratios, provide strong constraints on the location of the line emitting gas in the broad-line region (BLR) of active galactic nuclei (AGNs). In this paper, I present new calculations of radiation pressure and magnetic pressure confined clouds and apply them to a ‘generic AGN’ and to NGC 5548. The new calculations are in good agreement with the observed lags of all broad emission lines, and with the luminosities of Ly α, C iv 1549, O vi 1035, and He ii 1640. They are also in reasonable agreement with the luminosities of Mg ii 2798 and the 1990 Å blend of C iii] and Si iii] lines for high-metallicity gas. They explain the changes in time-lag following an increase in continuum luminosity and their dependencies on the inner and outer boundaries of the BLR. They also predict very strong Balmer and Paschen continua with important implications to continuum RM experiments. However, the calculated Balmer and Paschen line luminosities are too weak, by factors of 2–5. This ‘Balmer line crisis’ was noted in several earlier works and is now confirmed and constrained by RM measurements that were not available in the past. It seems that present photoionization codes that use the escape probability formalism fail to correctly compute the Balmer line luminosities in high-density, large optical depth gas.

scholarly journals Modelling the AGN broad-line region using single-epoch spectra − II. Nearby AGNs

2020 ◽  
Vol 493 (1) ◽  
pp. 1227-1248 ◽  
Author(s):  
S I Raimundo ◽  
M Vestergaard ◽  
M R Goad ◽  
C J Grier ◽  
P R Williams ◽  
...  
Keyword(s):  
Physical Model ◽  
Galaxy Evolution ◽  
High Redshift ◽  
Cost Effective ◽  
Monitoring Data ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Single Epoch

ABSTRACT The structure of the broad-line region (BLR) is an essential ingredient in the determination of active galactic nucleus (AGN) virial black hole masses, which in turn are important to study the role of black holes in galaxy evolution. Constraints on the BLR geometry and dynamics can be obtained from velocity-resolved studies using reverberation mapping data (i.e. monitoring data). However, monitoring data are observationally expensive and only available for a limited sample of AGNs, mostly confined to the local Universe. Here, we explore a new version of a Bayesian inference, physical model of the BLR that uses an individual spectrum and prior information on the BLR size from the radius–luminosity relation, to model the AGN BLR geometry and dynamics. We apply our model to a sample of 11 AGNs, which have been previously modelled using monitoring data. Our single-epoch BLR model is able to constrain some of the BLR parameters with inferred parameter values that agree within the uncertainties with those determined from the modelling of monitoring data. We find that our model is able to derive stronger constraints on the BLR for AGNs with broad emission lines that qualitatively have more substructure and more asymmetry, presumably as they contain more information to constrain the physical model. The performance of this model makes it a practical and cost-effective tool to determine some of the BLR properties of a large sample of low- and high-redshift AGNs, for which monitoring data are not available.

scholarly journals REVERBERATION MAPPING OF THE BROAD-LINE REGION IN NGC 5548: EVIDENCE FOR RADIATION PRESSURE?

2016 ◽  
Vol 827 (2) ◽  
pp. 118 ◽  
Author(s):  
Kai-Xing Lu ◽  
Pu Du ◽  
Chen Hu ◽  
Yan-Rong Li ◽  
Zhi-Xiang Zhang ◽  
...  
Keyword(s):  
Radiation Pressure ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Ngc 5548

scholarly journals Kinematics of the Broad-line Region of 3C 273 from a 10 yr Reverberation Mapping Campaign

2019 ◽  
Vol 876 (1) ◽  
pp. 49 ◽  
Author(s):  
Zhi-Xiang Zhang ◽  
Pu Du ◽  
Paul S. Smith ◽  
Yulin Zhao ◽  
Chen Hu ◽  
...  
Keyword(s):  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region

scholarly journals The Deviation of the Size of the Broad-line Region between Reverberation Mapping and Spectroastrometry

2021 ◽  
Vol 914 (2) ◽  
pp. 143
Author(s):  
Xiaer Zhang ◽  
Zhicheng He ◽  
Tinggui Wang ◽  
Hengxiao Guo
Keyword(s):  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region
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