The Main Sequence of quasars: the taming of the extremes
arXiv:2111.04140 · doi:10.1002/asna.20210082
Abstract
The last few years have seen the confirmation of several trends associated with the quasar main sequence. The idea of a main sequence for quasars is relatively recent, and its full potential for the observational classification and contextualization of quasar properties has yet to be fully exploited. The main sequence drivers are discussed in terms of the properties of extreme objects. We briefly summarize developments that constrain the viewing angle of the accretion disk in a particular class of quasars (extreme Population B, radiating at low Eddington ratio), as well as inferences on the chemical composition of the broad line emitting gas, and on the nature of radio emission along the quasar main sequence.
Paper presented at the XIII SCSLSA, to appear in Astronomische Nachrichten
References in corpus (20)
- The diversity of quasars unified by accretion and orientation
- Radio-loud Narrow-Line Type 1 Quasars
- CIV 1549 as an Eigenvector 1 Parameter for Active Galactic Nuclei
- Supermassive black holes with high accretion rates in active galactic nuclei: II. the most luminous standard candles in the Universe
- New Insights on the QSO Radio-Loud/Radio-Quiet Dichotomy: SDSS Spectra in the Context of the 4D Eigenvector1 Parameter Space
- Highly Accreting Quasars: Sample Definition and Possible Cosmological Implications
- Dissecting the quasar main sequence: insight from host galaxy properties
- State-of-the-art AGN SEDs for Photoionization Models: BLR Predictions Confront the Observations
- High metal content of highly accreting quasars
- HST unveils a compact mildly relativistic Broad Line Region in the candidate true type 2 NGC 3147
- Dark energy constraints from quasar observations
- Exploring the Diversity of Type 1 Active Galactic Nuclei Identified in SDSS-IV/SPIDERS
- High-ionization emission line ratios from quasar broad line regions: metallicity or density?
- 3C 57 as an Atypical Radio-Loud Quasar: Implications for the Radio-Loud/Radio-Quiet Dichotomy
- Extreme quasars as distance indicators in cosmology
- AGN Broad Line Region variability in the context of Eigenvector 1: case of NGC 5548
- The Extreme Red Excess in Blazar Ultraviolet Broad Emission Lines
- Interpreting automatic AGN classifiers with saliency maps
- Linear Spectropolarimetric Analysis of Fairall 9 with VLT/FORS2
- Past, present and Future of the Scaling Relations of Galaxies and Active Galactic Nuclei