scholarly journals Simulations of the broad line region of NGC 5548 with CLOUDY code: Temperature determination

2007 ◽  
pp. 15-18 ◽  
Author(s):  
D. Ilic
Keyword(s):  
Physical Properties ◽  
Active Galaxy ◽  
Broad Line ◽  
Boltzmann Plot ◽  
Temperature Determination ◽  
Hydrogen Density ◽  
Physical Conditions ◽  
Broad Line Region ◽  
Line Region ◽  
Ngc 5548

In this paper an analysis of the physical properties of the Broad Line Region (BLR) of the active galaxy NGC 5548 is presented. Using the photoionization code CLOUDY and the measurements of Peterson et al. (2002), the physical conditions of the BLR are simulated and the BLR temperature is obtained. This temperature was compared to the temperature estimated with the Boltzmann-Plot (BP) method (Popovic et al. 2007). It was shown that the measured variability in the BLR temperature could be due to the change in the hydrogen density.

scholarly journals Probing the Physical Properties of the NGC 5548 Broad Line Region Using Balmer Lines

2008 ◽  
Vol 60 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Luka Č. Popović ◽  
Alla I. Shapovalova ◽  
Vahram H. Chavushyan ◽  
Dragana Ilić ◽  
Alexandr N. Burenkov ◽  
...  
Keyword(s):  
Physical Properties ◽  
Broad Line ◽  
Broad Line Region ◽  
Line Region ◽  
Balmer Lines ◽  
Ngc 5548

scholarly journals The broad line region of AGN: Kinematics and physics

2006 ◽  
pp. 1-11 ◽  
Author(s):  
L.C. Popovic
Keyword(s):  
Electron Temperature ◽  
Accretion Disk ◽  
Emission Lines ◽  
Physical Parameters ◽  
Broad Line ◽  
Physical Conditions ◽  
Broad Line Region ◽  
Broad Emission ◽  
Line Region

In this paper a discussion of kinematics and physics of the Broad Line Region (BLR) is given. The possible physical conditions in the BLR and problems in determination of the physical parameters (electron temperature and density) are considered. Moreover, one analyses the geometry of the BLR and the probability that (at least) a fraction of the radiation in the Broad Emission Lines (BELs) originates from a relativistic accretion disk.

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.

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