A main sequence for quasars

DOI: 
10.3389/fspas.2018.00006
Publication date: 
01/03/2018
Main author: 
Marziani, Paola
IAA authors: 
Sulentic, Jack W.;Del Olmo, Ascensión;Martínez-Aldama, Mary L.
Authors: 
Marziani, Paola;Dultzin, Deborah;Sulentic, Jack W.;Del Olmo, Ascensión;Negrete, C. A.;Martínez-Aldama, Mary L.;D'Onofrio, Mauro;Bon, Edi;Bon, Natasa;Stirpe, Giovanna M.
Journal: 
Frontiers in Astronomy and Space Sciences
Refereed: 
Yes
Publication type: 
Article
Volume: 
5
Pages: 
6
Abstract: 
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 systematic trends in observational properties that are the basis of physical and dynamical modeling of quasar structure. We discuss the empirical correlates of the so-called “main sequence” associated with the quasar Eigenvector 1, its governing physical parameters and several implications on our view of the quasar structure, as well as some luminosity effects associated with the virialized component of the line emitting regions. We also briefly discuss quasars in a segment of the main sequence that includes the strongest FeII emitters. These sources show a small dispersion around a well-defined Eddington ratio value, a property which makes them potential Eddington standard candles.
Database: 
ADS
URL: 
https://ui.adsabs.harvard.edu/#abs/2018FrASS...5....6M/abstract
ADS Bibcode: 
2018FrASS...5....6M
Keywords: 
Galaxy evolution;quasars;Eigenvector 1;Outflows;emission lines;Supermassive black holes;black hole physics;accretion disk