Add to ORKGItem does not contain fulltextWe present the first short time-scale (∼ hours to days) optical variability study of a large sample of active galactic nuclei (AGNs) observed with the Kepler/K2 mission. The sample contains 252 AGN observed over four campaigns with ∼30 min cadence selected from the Million Quasar Catalogue with R magnitude <19. We performed time series analysis to determine their variability properties by means of the power spectral densities (PSDs) and applied Monte Carlo techniques to find the best model parameters that fit the observed power spectra. A power-law model is sufficient to describe all the PSDs of our sample. A variety of power-law slopes were found indicating that there is not a universal slope for all AGNs. We ...
Active Galactic Nuclei (AGN) are the some of the most luminous objects in the Universe, however thei...
We systematically analyze the X-ray variability of active galactic nuclei (AGNs) in the 7 Ms Chandra...
<p>Variability is one of the most defining characteristic of Active Galactic Nuclei (AGN), and it is...
We present the first short time-scale (∼hours to days) optical variability study of a large sample o...
We have used photometry from the Kepler satellite to characterize the variability of four radio-loud...
We present a comprehensive analysis of 21 light curves of Type 1 active galactic nuclei (AGN) from t...
Over three quarters in 2010–2011, Kepler monitored optical emission from four active galactic nuclei...
Active Galactic Nuclei (AGN) exhibit strong, rapid optical luminosity fluctuations that are often de...
The mechanism of the optical variability of active galactic nuclei (AGN) is still very puzzling. It ...
At present, most of the variability studies of active galactic nuclei (AGNs) are based on ensemble a...
Variability characterizes AGNs at all wavelengths, with timescales from minutes to years depending o...
Aims. The goal of this work is to better understand the correlations between the rest-fram...
Context. Variability in the X-rays is a key ingredient in understanding and unveiling active galacti...
The ensemble optical/ultraviolet (UV) variability of narrow-line Seyfert 1 (NLS1)-type active galact...
The goal of this work is to better understand the correlations between the rest-frame UV/optical var...
Active Galactic Nuclei (AGN) are the some of the most luminous objects in the Universe, however thei...
We systematically analyze the X-ray variability of active galactic nuclei (AGNs) in the 7 Ms Chandra...
<p>Variability is one of the most defining characteristic of Active Galactic Nuclei (AGN), and it is...
We present the first short time-scale (∼hours to days) optical variability study of a large sample o...
We have used photometry from the Kepler satellite to characterize the variability of four radio-loud...
We present a comprehensive analysis of 21 light curves of Type 1 active galactic nuclei (AGN) from t...
Over three quarters in 2010–2011, Kepler monitored optical emission from four active galactic nuclei...
Active Galactic Nuclei (AGN) exhibit strong, rapid optical luminosity fluctuations that are often de...
The mechanism of the optical variability of active galactic nuclei (AGN) is still very puzzling. It ...
At present, most of the variability studies of active galactic nuclei (AGNs) are based on ensemble a...
Variability characterizes AGNs at all wavelengths, with timescales from minutes to years depending o...
Aims. The goal of this work is to better understand the correlations between the rest-fram...
Context. Variability in the X-rays is a key ingredient in understanding and unveiling active galacti...
The ensemble optical/ultraviolet (UV) variability of narrow-line Seyfert 1 (NLS1)-type active galact...
The goal of this work is to better understand the correlations between the rest-frame UV/optical var...
Active Galactic Nuclei (AGN) are the some of the most luminous objects in the Universe, however thei...
We systematically analyze the X-ray variability of active galactic nuclei (AGNs) in the 7 Ms Chandra...
<p>Variability is one of the most defining characteristic of Active Galactic Nuclei (AGN), and it is...