Frontiers in Astronomy and Space Sciences | |
A Main Sequence for Quasars | |
Marziani, Paola4  DOnofrio, Mauro6  Del Olmo, Ascensin6  Stirpe, Giovanna M.7  Dultzin, Deborah7  Bon, Natasa8  Martnez-Aldama, Mary L.8  Sulentic, Jack W.9  Negrete, C. A.1,10  Bon, Edi1,10  | |
[1] di Padova, Italy;Belgrade Astronomical Observatory, Serbia;Dipartimento di Fisica e Astronomia âGalileo Galileiâ, UniversitàINAF, Osservatorio Astronomico di Padova, Italy;INAF, Osservatorio di Astrofisica e Scienza dello Spazio di Bologna, Italy;Instituto de AstrofíInstituto de Astronomía (CSIC), Spain;a, Universidad Nacional Autonoma de Mexico, Mexico;sica de Andalucí | |
关键词: Galaxy evolution; quasars; Eigenvector 1; Outflows; emission lines; Supermassive black holes; black hole physics; accretion disk; | |
DOI : 10.3389/fspas.2018.00006 | |
学科分类:空间科学 | |
来源: Frontiers | |
【 摘 要 】
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 âmain sequenceâ 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.
【 授权许可】
CC BY
【 预 览 】
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RO201904023539272ZK.pdf | 4258KB | download |