A main sequence for quasars
P Marziani, D Dultzin, JW Sulentic… - Frontiers in Astronomy …, 2018 - frontiersin.org
The last 25 years saw a major step forward in the analysis of optical and UV spectroscopic
data of large quasar samples. Multivariate statistical approaches have led to the definition of …
data of large quasar samples. Multivariate statistical approaches have led to the definition of …
Metal enrichment due to embedded stars in AGN discs
J Huang, DNC Lin, G Shields - Monthly Notices of the Royal …, 2023 - academic.oup.com
We separately assess elemental abundances in active galactic nuclei's (AGNs) broad and
narrow emission line regions (BLR and NLR), based on a critical assessment of published …
narrow emission line regions (BLR and NLR), based on a critical assessment of published …
Using [Ne V]/[Ne III] to understand the nature of extreme-ionization galaxies
Spectroscopic studies of extreme-ionization galaxies (EIGs) are critical to our understanding
of exotic systems throughout cosmic time. These EIGs exhibit spectral features requiring> …
of exotic systems throughout cosmic time. These EIGs exhibit spectral features requiring> …
PS18kh: a new tidal disruption event with a non-axisymmetric accretion disk
TWS Holoien, ME Huber, BJ Shappee… - The Astrophysical …, 2019 - iopscience.iop.org
We present the discovery of PS18kh, a tidal disruption event discovered at the center of
SDSS J075654. 53+ 341543.6 (d≃ 322 Mpc) by the Pan-STARRS Survey for Transients …
SDSS J075654. 53+ 341543.6 (d≃ 322 Mpc) by the Pan-STARRS Survey for Transients …
Modeling of the quasar main sequence in the optical plane
The concept of the quasar main sequence is very attractive since it stresses correlations
between various parameters and implies the underlying simplicity. In the optical plane …
between various parameters and implies the underlying simplicity. In the optical plane …
Modelling broad emission lines in active galactic nuclei
B Czerny - Open Astronomy, 2019 - degruyter.com
Abstract 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 …
the mechanism of creating a medium able to emit these intense lines is not quite clear …
Failed radiatively accelerated dusty outflow model of the broad line region in active galactic nuclei. I. Analytical solution
The physical origin of the broad line region in active galactic nuclei is still unclear despite
many years of observational studies. The reason is that the region is unresolved, and the …
many years of observational studies. The reason is that the region is unresolved, and the …
High metal content of highly accreting quasars
M Śniegowska, P Marziani, B Czerny… - The Astrophysical …, 2021 - iopscience.iop.org
We present an analysis of UV spectra of 13 quasars believed to belong to extreme
Population A (xA) quasars, aimed at the estimation of the chemical abundances of the broad …
Population A (xA) quasars, aimed at the estimation of the chemical abundances of the broad …
Broad-line region in active galactic nuclei: Dusty or dustless?
Context. Dust in active galactic nuclei is clearly present right outside the broad-line region
(BLR) in the form of a dusty molecular torus. However, some models of the BLR predict that …
(BLR) in the form of a dusty molecular torus. However, some models of the BLR predict that …
Radiation pressure on dust explaining the low ionized broad emission lines in active galactic nuclei-Dust as an important driver of line shape
Context. Broad emission lines are the most characteristic features in the spectra of galaxies
with an active galactic nucleus (AGN). They mostly show either single-peaked or double …
with an active galactic nucleus (AGN). They mostly show either single-peaked or double …