89 citations · 425 across the 22 of their papers we have counts for
4 papers · 1 filter
Narrow-line Seyfert 1 galaxies in the context of the Quasar Main Sequence
Bozena Czerny, Swayamtrupta Panda, Marzena Sniegowska +4
Narrow-line Seyfert 1 galaxies are defined on the basis of their line widths, and they are generally considered to be high Eddington ratio sources. But in the context of the Quasar…
The Optical Variability of SDSS Quasars from Multi-epoch Spectroscopy. III. A Sudden UV Cutoff in Quasar SDSS J2317+0005
Hengxiao Guo, Matthew A. Malkan, Minfeng Gu +6
We have collected near-infrared to X-ray data of 20 multi-epoch heavily reddened SDSS quasars to investigate the physical mechanism of reddening. Of these, J2317+0005 is found to b…
SALT long-slit spectroscopy of HE 0435-4312: fast displacement in the Mg II emission line
J. Sredzinska, B. Czerny, K. Hryniewicz +6
The Mg II emission line is visible in the optical band for intermediate redshift quasars (0.4 < z < 1.6) and it is thus an extremely important tool to measure the black hole mass a…
The mass of the black hole in RE J1034+396
B. Czerny, B. You, A. Kurcz +6
The black hole mass measurement in active galaxies is a challenge, particularly in sources where the reverberation method cannot be applied. We aim to determine the black hole mass…