Variability of active galactic nuclei
MH Ulrich, L Maraschi, CM Urry - Annual Review of Astronomy …, 1997 - annualreviews.org
▪ Abstract A large collective effort to study the variability of active galactic nuclei (AGN) over
the past decade has led to a number of fundamental results on radio-quiet AGN and blazars …
the past decade has led to a number of fundamental results on radio-quiet AGN and blazars …
Reverberation mapping and the physics of active galactic nuclei
H Netzer, BM Peterson - Astronomical Time Series: Proceedings of The …, 1997 - Springer
Reverberation-mapping campaigns have revolutionized our understanding of AGN. They
have allowed the direct determination of the broad-line region size, enabled mapping of the …
have allowed the direct determination of the broad-line region size, enabled mapping of the …
On Uncertainties in Cross‐Correlation Lags and the Reality of Wavelength‐dependent Continuum Lags in Active Galactic Nuclei
We describe a model‐independent method of assessing the uncertainties in cross‐
correlation lags determined from the light curves of active galactic nuclei (AGNs) and use …
correlation lags determined from the light curves of active galactic nuclei (AGNs) and use …
The relationship between luminosity and broad-line region size in active galactic nuclei
S Kaspi, D Maoz, H Netzer, BM Peterson… - The Astrophysical …, 2005 - iopscience.iop.org
We reinvestigate the relationship between the characteristic broad-line region size (R BLR)
and the Balmer emission-line, X-ray, UV, and optical continuum luminosities. Our study …
and the Balmer emission-line, X-ray, UV, and optical continuum luminosities. Our study …
Supermassive black holes and the evolution of galaxies
Black holes, an extreme consequence of the mathematics of General Relativity, have long
been suspected of being the prime movers of quasars, which emit more energy than any …
been suspected of being the prime movers of quasars, which emit more energy than any …
Space telescope and optical reverberation mapping project. II. Swift and HST reverberation mapping of the accretion disk of NGC 5548
Recent intensive Swift monitoring of the Seyfert 1 galaxy NGC 5548 yielded 282 usable
epochs over 125 days across six UV/optical bands and the X-rays. This is the densest …
epochs over 125 days across six UV/optical bands and the X-rays. This is the densest …
The ultraviolet and optical continuum emission in active galactic nuclei: the status of accretion disks
A Koratkar, O Blaes - Publications of the Astronomical Society of …, 1999 - iopscience.iop.org
ABSTRACT A fundamental component of models of active galactic nuclei (AGNs) is an
accretion disk around a supermassive black hole. However, the nature of this accretion disk …
accretion disk around a supermassive black hole. However, the nature of this accretion disk …
A spectral decomposition of the variable optical, ultraviolet and X-ray continuum of NGC 5548
P Magdziarz, OM Blaes, AA Zdziarski… - Monthly Notices of …, 1998 - academic.oup.com
We present an analysis and decomposition of the broad-band optical/UV/X-ray/γ-ray
spectrum of the Seyfert 1 galaxy NGC 5548. The spectrum consists of an average of …
spectrum of the Seyfert 1 galaxy NGC 5548. The spectrum consists of an average of …
Optical variability in active galactic nuclei: starbursts or disk instabilities?
T Kawaguchi, S Mineshige, M Umemura… - The Astrophysical …, 1998 - iopscience.iop.org
Aperiodic optical variability is a common property of active galactic nuclei (AGNs), though its
physical origin is still open to question. To study the origin of the optical-ultraviolet variability …
physical origin is still open to question. To study the origin of the optical-ultraviolet variability …
A multiwavelength view of the TeV blazar markarian 421: Correlated variability, flaring, and spectral evolution
M Błażejowski, G Blaylock, IH Bond… - The Astrophysical …, 2005 - iopscience.iop.org
We report results from an intensive multiwavelength monitoring campaign on the TeV blazar
Mrk 421 over the period of 2003-2004. The source was observed simultaneously at TeV …
Mrk 421 over the period of 2003-2004. The source was observed simultaneously at TeV …