scholarly journals Modelling the AGN broad line region using single-epoch spectra – I. The test case of Arp 151

2019 ◽  
Vol 489 (2) ◽  
pp. 1899-1918 ◽  
Author(s):  
S I Raimundo ◽  
A Pancoast ◽  
M Vestergaard ◽  
M R Goad ◽  
A J Barth
Keyword(s):  
Black Hole ◽  
High Redshift ◽  
Monitoring Data ◽  
Test Case ◽  
Broad Line ◽  
Broad Line Region ◽  
Line Region ◽  
Single Epoch ◽  
Black Hole Masses ◽  
Dynamical Modelling

ABSTRACT We show that individual (single-epoch) spectra of active galactic nuclei (AGNs) can constrain some of the geometry and dynamics of the AGN broad line region. Studies of the cosmic influence of supermassive black holes are limited by the current large uncertainties in the determination of black hole masses. One dominant limitation is the unknown geometry, dynamics, and line-of-sight inclination of the broad line region, used to probe the central black hole mass. Recent progress has been made to constrain the spatial and kinematic structure of the broad line region using dynamical modelling of AGN monitoring data and an underlying physical model for the broad line region. In this work we test the ability of a modified version of this dynamical modelling code to constrain the broad line region structure using single-epoch spectra. We test our modelling code on single-epoch spectra of nearby Arp 151 by comparing our results with those obtained with monitoring data of this same object. We find that a significant fraction of the broad line region parameters can indeed be adequately constrained, with uncertainties that are comparable to, or at most a factor of approximately a few higher than those obtained from modelling of monitoring data. Considering the wealth of available single-epoch spectroscopic observations, this method is promising for establishing the overall AGN population trends in the geometry and dynamics of the broad line region. This method can be applied to spectra of AGNs at low and high redshift making it valuable for studies of cosmological black hole and AGN evolution.

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 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 Measurements of Black Hole Masses and Broad-line Region Kinematics in Mrk 817 and NGC 7469

2021 ◽  
Vol 918 (2) ◽  
pp. 50
Author(s):  
Kai-Xing Lu ◽  
Jian-Guo Wang ◽  
Zhi-Xiang Zhang ◽  
Ying-Ke Huang ◽  
Liang Xu ◽  
...  
Keyword(s):  
Black Hole ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Black Hole Masses ◽  
Ngc 7469

scholarly journals High-Redshift Quasar Monitoring Campaign: Preliminary Results

2009 ◽  
Vol 5 (S267) ◽  
pp. 198-198 ◽  
Author(s):  
Ismael Botti ◽  
Paulina Lira ◽  
Hagai Netzer ◽  
Shai Kaspi
Keyword(s):  
Black Hole ◽  
High Redshift ◽  
Broad Line ◽  
Black Hole Mass ◽  
High Luminosity ◽  
Monitoring Campaign ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Region Size

AbstractWe present a monitoring campaign on high-luminosity quasars which will extend the existing reverberation mapping results by two orders of magnitude in luminosity, probing the broad-line region size and black hole mass of luminous AGN at redshift ~ 2 – 3.

scholarly journals THE LICK AGN MONITORING PROJECT: BROAD-LINE REGION RADII AND BLACK HOLE MASSES FROM REVERBERATION MAPPING OF Hβ

2009 ◽  
Vol 705 (1) ◽  
pp. 199-217 ◽  
Author(s):  
Misty C. Bentz ◽  
Jonelle L. Walsh ◽  
Aaron J. Barth ◽  
Nairn Baliber ◽  
Vardha Nicola Bennert ◽  
...  
Keyword(s):  
Black Hole ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Black Hole Masses

scholarly journals Magnetization of AGN jets as imposed by leptonic models of luminous blazars

2014 ◽  
Vol 10 (S313) ◽  
pp. 85-86
Author(s):  
Mateusz Janiak ◽  
Marek Sikora ◽  
Rafal Moderski
Keyword(s):  
Black Hole ◽  
Kinetic Energy ◽  
Energy Flux ◽  
Broad Line ◽  
Jet Formation ◽  
Frequency Dependent ◽  
Broad Line Region ◽  
Line Region ◽  
Γ Ray ◽  
Dusty Torus

AbstractRecent measurements of frequency-dependent shift of radio-core locations indicate that the ratio of the magnetic to kinetic energy flux (the σ parameter) is of the order of unity. These results are consistent with predictions of magnetically-arrested-disk (MAD) models of a jet formation, but contradict the predictions of leptonic models of γ-ray production in luminous blazars. We demonstrate this discrepancy by computing the γ-ray-to-synchrotron luminosity ratio (the q parameter) as a function of a distance from the black hole for different values of σ and using both spherical and planar models for broad-line region and dusty torus. We find that it is impossible to reproduce observed q ≫ 1 for jets with σ ≥ 1. This may indicate that blazar radiation is produced in reconnection layers or in spines of magnetically stratified jets.

scholarly journals Modelling photometric reverberation data: a disk-like broad-line region and a potentially larger black hole mass for 3C 120

2014 ◽  
Vol 568 ◽  
pp. A36 ◽  
Author(s):  
F. Pozo Nuñez ◽  
M. Haas ◽  
M. Ramolla ◽  
C. Bruckmann ◽  
C. Westhues ◽  
...  
Keyword(s):  
Black Hole ◽  
Broad Line ◽  
Black Hole Mass ◽  
Broad Line Region ◽  
Line Region ◽  
3C 120

scholarly journals A NEW METHOD TO OBTAIN THE BROAD LINE REGION SIZE OF HIGH REDSHIFT QUASARS

2014 ◽  
Vol 794 (1) ◽  
pp. 95 ◽  
Author(s):  
C. Alenka Negrete ◽  
Deborah Dultzin ◽  
Paola Marziani ◽  
Jack W. Sulentic
Keyword(s):  
High Redshift ◽  
New Method ◽  
Broad Line ◽  
Broad Line Region ◽  
Line Region ◽  
Region Size
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