271 citations · 4.6k across the 192 of their papers we have counts for
10 papers · 2 filters
Effect of Electromagnetic Interaction on Galactic Center Flare Components
Arman Tursunov, Michal Zajaček, Andreas Eckart +5
Recently, near-infrared GRAVITY@ESO observations at have announced the detection of three bright "flares" in the vicinity of the Galactic center supermassive black…
Distribution of Radio Spectral Slopes of Galaxies in Optical Diagnostic Diagrams
Michal Zajaček, Andreas Eckart, Silke Britzen +1
For about 500 intermediate-redshift sources (), whose radio flux densities at are larger than 10 mJy, we performed additional observations at 4.85 GHz…
Quasars from LSST as dark energy tracers: first steps
Mary Loli Martínez-Aldama, Swayamtrupta Panda, Bożena Czerny +1
In the near future, new surveys promise a significant increase in the number of quasars (QSO) at large redshifts. This will help to constrain the dark energy models using quasars.…
Modelling broad emission lines in active galactic nuclei
Bozena Czerny
Broad Emission Lines are the most characteristic features of Active Galaxies, but the mechanism of creating a medium able to emit these intense lines is not quite clear. Observatio…
Quasar Main Sequence: a line or a plane?
Conor Wildy, Bozena Czerny, Swayamtrupta Panda
A quasar main sequence is widely believed to reveal itself through objects represented in a plane spanned by two parameters: the full-width at half-maximum (FWHM) of H, and the…
Reverberation-mapping of distant quasars: time-lag determination using different methods
Michal Zajaček, Bożena Czerny, Mary-Loli Martinez Aldama +1
By applying different statistically robust methods, we analyze the time-lag between the continuum and ionized line-emission (Mg II line) light curves for the distant bright quasar…
Slim accretion disks: theory and observational consequences
Bozena Czerny
Slim accretion disks idea emerged over 30 years ago as an answer to several unsolved problems. Since that time there was a tremendous increase in the amount of observational data w…
Mechanism of the Changing Look phenomenon in Active Galactic Nuclei
Marzena Śniegowska, Bożena Czerny
Changing-look phenomenon observed now in a growing number of active galaxies challenges our understanding of the accretion process close to a black hole. We propose a simple explan…
Stellar populations in hosts of giant radio galaxies and their neighbouring galaxies
Agnieszka Kuźmicz, Bożena Czerny, Conor Wildy
Context: Giant radio galaxies (with projected linear size of radio structure larger than 0.7 Mpc) are very rare and unusual objects. Only 5% of extended radio sources reach s…
Time delay measurement of Mg II line in CTS C30.10 with SALT
Bozena Czerny, Aleksandra Olejak, Mateusz Ralowski +18
We report 6 yr monitoring of a distant bright quasar CTS C30.10 (z = 0.90052) with the Southern African Large Telescope (SALT). We measured the rest-frame time-lag of da…