Add to ORKGOptical spectral variability of quasars and BL Lac Objects is compared by means of the spectral variability parameter beta (Trevese & Vagnetti 2002). Both kinds of objects change their spectral slopes alpha, becoming bluer when brighter, but BL Lac Objects have smaller beta values and are clearly separated from quasars in the alpha-beta plane. Models accounting for the origin of the variability are discussed for both classes of objects
We present results of a broadband photometric study of the optical variability of six narrow-line Se...
The relationship between variability, luminosity and redshift in the South Galactic Pole QSO sample ...
We investigate the optical variability of 7658 quasars from SDSS Stripe 82. Taking advantage of a la...
Light curves of eight BL Lac objects in the BVRI bands have been analyzed. All of the objects tend t...
We performed a new analysis of B and R light curves of a sample of PG quasars. We confirm the variab...
The variability of the continuum spectral energy distribution has been analyzed for a complete magni...
In previous studies we have shown that the optical variability of quasars increases, on average, wit...
We have used optical V and R band observations from the Massive Compact Halo Object (MACHO) project ...
Light curves of eight BL Lac objects in the BVRI bands have been analyzed. All of the objects tend t...
Many quasi-simultaneous optical observations of 17 blazars are obtained from previous papers publish...
Thesis (Ph.D.)--University of Washington, 2017-08More than 50 years after the initial discovery of t...
Context.It has been shown that the luminosity of active galactic nuclei and the size of their broad ...
Context. X-ray spectral variability analyses of active galactic nuclei (AGN) with moderate luminosit...
We characterize the optical variability properties of eight lobe-dominated radio quasars (QSOs): B2 ...
This work aimed to find the relationship between quasars' optical variability and spectral features ...
We present results of a broadband photometric study of the optical variability of six narrow-line Se...
The relationship between variability, luminosity and redshift in the South Galactic Pole QSO sample ...
We investigate the optical variability of 7658 quasars from SDSS Stripe 82. Taking advantage of a la...
Light curves of eight BL Lac objects in the BVRI bands have been analyzed. All of the objects tend t...
We performed a new analysis of B and R light curves of a sample of PG quasars. We confirm the variab...
The variability of the continuum spectral energy distribution has been analyzed for a complete magni...
In previous studies we have shown that the optical variability of quasars increases, on average, wit...
We have used optical V and R band observations from the Massive Compact Halo Object (MACHO) project ...
Light curves of eight BL Lac objects in the BVRI bands have been analyzed. All of the objects tend t...
Many quasi-simultaneous optical observations of 17 blazars are obtained from previous papers publish...
Thesis (Ph.D.)--University of Washington, 2017-08More than 50 years after the initial discovery of t...
Context.It has been shown that the luminosity of active galactic nuclei and the size of their broad ...
Context. X-ray spectral variability analyses of active galactic nuclei (AGN) with moderate luminosit...
We characterize the optical variability properties of eight lobe-dominated radio quasars (QSOs): B2 ...
This work aimed to find the relationship between quasars' optical variability and spectral features ...
We present results of a broadband photometric study of the optical variability of six narrow-line Se...
The relationship between variability, luminosity and redshift in the South Galactic Pole QSO sample ...
We investigate the optical variability of 7658 quasars from SDSS Stripe 82. Taking advantage of a la...