scholarly journals SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. III. OPTICAL CONTINUUM EMISSION AND BROADBAND TIME DELAYS IN NGC 5548

2016 ◽  
Vol 821 (1) ◽  
pp. 56 ◽  
Author(s):  
M. M. Fausnaugh ◽  
K. D. Denney ◽  
A. J. Barth ◽  
M. C. Bentz ◽  
M. C. Bottorff ◽  
...  
Keyword(s):  
Time Delays ◽  
Continuum Emission ◽  
Space Telescope ◽  
Reverberation Mapping ◽  
Optical Continuum ◽  
Ngc 5548

scholarly journals Space Telescope and Optical Reverberation Mapping Project. VII. Understanding the Ultraviolet Anomaly in NGC 5548 with X-Ray Spectroscopy

2017 ◽  
Vol 846 (1) ◽  
pp. 55 ◽  
Author(s):  
S. Mathur ◽  
A. Gupta ◽  
K. Page ◽  
R. W. Pogge ◽  
Y. Krongold ◽  
...  
Keyword(s):  
Space Telescope ◽  
X Ray ◽  
Reverberation Mapping ◽  
Ngc 5548

scholarly journals SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT.VI. REVERBERATING DISK MODELS FOR NGC 5548

2017 ◽  
Vol 835 (1) ◽  
pp. 65 ◽  
Author(s):  
D. Starkey ◽  
Keith Horne ◽  
M. M. Fausnaugh ◽  
B. M. Peterson ◽  
M. C. Bentz ◽  
...  
Keyword(s):  
Space Telescope ◽  
Reverberation Mapping ◽  
Ngc 5548

scholarly journals Optical continuum photometric reverberation mapping of the Seyfert-1 galaxy Mrk509

2019 ◽  
Author(s):  
F Pozo Nuñez ◽  
N Gianniotis ◽  
J Blex ◽  
T Lisow ◽  
R Chini ◽  
...  
Keyword(s):  
Time Delays ◽  
Narrow Band ◽  
Large Field ◽  
Black Hole Mass ◽  
Disk Model ◽  
Reverberation Mapping ◽  
Line Region ◽  
Optical Continuum ◽  
The Difference ◽  
Flux Calibration

Abstract We present the results of a two year optical continuum photometric reverberation mapping campaign carried out on the nucleus of the Seyfert-1 galaxy Mrk509. Specially designed narrow-band filters were used in order to mitigate the line and pseudo-continuum contamination of the signal from the broad line region, while allowing for high-accuracy flux-calibration over a large field of view. We obtained light curves with a sub-day time sampling and typical flux uncertainties of 1%. The high photometric precision allowed us to measure inter-band continuum time delays of up to ∼2 days across the optical range. The time delays are consistent with the relation τ∝λ4/3 predicted for an optically thick and geometrically thin accretion disk model. The size of the disk is, however, a factor of 1.8 larger than predictions based on the standard thin-disk theory. We argue that, for the particular case of Mrk509, a larger black hole mass due to the unknown geometry scaling factor can reconcile the difference between the observations and theory.

scholarly journals Space Telescope and Optical Reverberation Mapping Project. X. Understanding the Absorption-line Holiday in NGC 5548

2019 ◽  
Vol 877 (2) ◽  
pp. 119 ◽  
Author(s):  
M. Dehghanian ◽  
G. J. Ferland ◽  
G. A. Kriss ◽  
B. M. Peterson ◽  
S. Mathur ◽  
...  
Keyword(s):  
Absorption Line ◽  
Space Telescope ◽  
Reverberation Mapping ◽  
Ngc 5548

scholarly journals Space Telescope and Optical Reverberation Mapping Project. V. Optical Spectroscopic Campaign and Emission-line Analysis for NGC 5548

2017 ◽  
Vol 837 (2) ◽  
pp. 131 ◽  
Author(s):  
L. Pei ◽  
M. M. Fausnaugh ◽  
A. J. Barth ◽  
B. M. Peterson ◽  
M. C. Bentz ◽  
...  
Keyword(s):  
Emission Line ◽  
Space Telescope ◽  
Reverberation Mapping ◽  
Ngc 5548 ◽  
Line Analysis

scholarly journals SPACE TELESCOPE AND OPTICAL REVERBERATION MAPPING PROJECT. II.SWIFTANDHSTREVERBERATION MAPPING OF THE ACCRETION DISK OF NGC 5548

2015 ◽  
Vol 806 (1) ◽  
pp. 129 ◽  
Author(s):  
R. Edelson ◽  
J. M. Gelbord ◽  
K. Horne ◽  
I. M. McHardy ◽  
B. M. Peterson ◽  
...  
Keyword(s):  
Accretion Disk ◽  
Space Telescope ◽  
Reverberation Mapping ◽  
Ngc 5548

scholarly journals Anomalous Broad-Line Region responses to continuum variability in Active Galactic Nuclei – I. Hβ variability

2021 ◽  
Author(s):  
C Martin Gaskell ◽  
Kayla Bartel ◽  
Julia N Deffner ◽  
Iris Xia
Keyword(s):  
Galactic Nuclei ◽  
Broad Line ◽  
Reverberation Mapping ◽  
Broad Line Region ◽  
Line Region ◽  
Rapid Changes ◽  
Optical Continuum ◽  
Ngc 5548 ◽  
Possible Cause

Abstract In the standard AGN reverberation-mapping model, variations in broad-line region (BLR) fluxes are predicted from optical continuum variability (taken as a proxy for the ionizing continuum) convolved with a response function that depends on the geometry. However, it has long been known that BLR variability can deviate from these predictions. We analyse both extensive long-term Hβ and continuum monitoring of NGC 5548 and a large sample of high-quality Hβ light curves of other AGNs to investigate the frequency and characteristics of anomalous responses of the BLR. We find that anomalies are very common and probably occur in every object. Onsets can be on a timescale only slightly longer than the light-crossing time and durations are of the order of the characteristic timescale of variability of the optical continuum to several times longer. Anomalies are larger when NGC 5548 is in a low state, but otherwise there is no correlation with continuum variability. There is abundant evidence for the optical continuum of AGNs varying independently of the higher-energy continua and this is sufficient to explain the anomalous responses of the total BLR flux. There are good reasons for believing that the frequent lack of correlation between spectral regions is due to anisotropic and non-axisymmetric emission. Rapid changes in line profiles and velocity-dependent lags are consistent with this. Motion of compact absorbing clouds across the line of sight is another possible cause of anomalies. The prevalence of anomalies should be considered when planning reverberation-mapping campaigns.

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