scholarly journals The short-term disappearance of the broad-line region in NGC 5548: implications for the dusty torus model

1993 ◽  
Vol 262 (1) ◽  
pp. L31-L34 ◽  
Author(s):  
Z. Loska ◽  
B. Czerny ◽  
R. Szczerba
Keyword(s):  
Broad Line ◽  
Short Term ◽  
Broad Line Region ◽  
Line Region ◽  
Ngc 5548 ◽  
Dusty Torus

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 11.6. Spectral monitoring of AGN at the 6 meter telescope

1998 ◽  
Vol 184 ◽  
pp. 467-468
Author(s):  
N.G. Bochkarev ◽  
A.I. Shapovalova ◽  
A.N. Burenkov ◽  
V.V. Vlasyuk
Keyword(s):  
Special Astrophysical Observatory ◽  
Broad Line ◽  
North Caucasus ◽  
Ngc 4151 ◽  
Broad Line Region ◽  
Line Region ◽  
Ngc 5548 ◽  
Spectral Monitoring ◽  
Ngc 7469

To study broad line region (BLR) size and kinematics spectral monitoring of NGC 3516, NGC 4151, NGC 5548, NGC 7469 and 3C390.3 has been performed with the 6 m telescope of the Special Astrophysical Observatory (N. Arkhyz- North Caucasus) in 1986–1996. The spectra are obtained in the Nasmyth focus using the TV scanner with a resolution of 3–4Å and S/N= 10–25 within 4000–5200ÅÅ (1986–94, 500 spectra), and in the prime focus with the spectrograph UAGS (a long-slit mode) + CCD (resolution 5–10Å) or multi-pupil field spectrograph (MPFS) + CCD (resolution 4Å) within 4000–7000ÅÅ and S/N=50–100 (1995–96, 270 spectra).

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

Ultraviolet variability of NGC 5548 - Dynamics of the continuum production region and geometry of the broad-line region

1991 ◽  
Vol 371 ◽  
pp. 541 ◽  
Author(s):  
J. H. Krolik ◽  
Keith Horne ◽  
T. R. Kallman ◽  
M. A. Malkan ◽  
R. A. Edelson ◽  
...  
Keyword(s):  
Broad Line ◽  
Production Region ◽  
Broad Line Region ◽  
Line Region ◽  
Ngc 5548 ◽  
The Continuum

scholarly journals Hydromagnetic Wind Model for the Broad-Line Region of NGC 5548

1997 ◽  
Vol 159 ◽  
pp. 215-216 ◽  
Author(s):  
M.C. Bottorff ◽  
K.T. Korista ◽  
I. Shlosman ◽  
R.D. Blandford
Keyword(s):  
Broad Line ◽  
Line Profiles ◽  
Wind Model ◽  
Broad Line Region ◽  
Line Region ◽  
Ngc 5548 ◽  
Model C

AbstractA hydromagnetic wind model from a dusty molecular disk (Emmering, Blandford, & Shlosman 1992) was applied to the BLR in NGC 5548 and produced synthetic C IV line profiles as a function of time. The model C IV profiles are compared to data from the 1993 IUE/HST campaign and properties of the the BLR of NGC 5548 are inferred.

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