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DTSTART;TZID=Europe/Rome:20170214T143000
DTEND;TZID=Europe/Rome:20170214T153000
DTSTAMP:20260405T081404
CREATED:20160915T090957Z
LAST-MODIFIED:20160915T090957Z
UID:1539-1487082600-1487086200@www.oa-roma.inaf.it
SUMMARY:A main sequence for quasars
DESCRIPTION:The last 15 years have seen a major step forward in the analysis of optical UV spectroscopic data of large quasar samples.  Multivariate statistical approaches have proved to be especially helpful\, as they have led to the definition of systematic trends (first and second eigenvector derived from Principal Component Analysis) in observed properties that are the basis of physical and dynamical modeling of quasar structure. In this talk I will discuss the empirical correlates of the so-called quasar “main sequence” associated with the quasar eigenvector 1\, its governing physical parameters\, as well as luminosity effects associated with the second eigenvector.  I will also briefly discuss  quasars in a segment of the main sequence which 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”.
URL:https://www.oa-roma.inaf.it/event/seminario-3/
LOCATION:Aula Gratton
CATEGORIES:Seminari
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BEGIN:VEVENT
DTSTART;TZID=Europe/Rome:20170214T143000
DTEND;TZID=Europe/Rome:20170214T153000
DTSTAMP:20260405T081404
CREATED:20160915T090957Z
LAST-MODIFIED:20160915T090957Z
UID:4685-1487082600-1487086200@www.oa-roma.inaf.it
SUMMARY:A main sequence for quasars
DESCRIPTION:The last 15 years have seen a major step forward in the analysis of optical UV spectroscopic data of large quasar samples.  Multivariate statistical approaches have proved to be especially helpful\, as they have led to the definition of systematic trends (first and second eigenvector derived from Principal Component Analysis) in observed properties that are the basis of physical and dynamical modeling of quasar structure. In this talk I will discuss the empirical correlates of the so-called quasar “main sequence” associated with the quasar eigenvector 1\, its governing physical parameters\, as well as luminosity effects associated with the second eigenvector.  I will also briefly discuss  quasars in a segment of the main sequence which 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”.
URL:https://www.oa-roma.inaf.it/event/seminario-3-2/
LOCATION:Aula Gratton
CATEGORIES:Seminari
END:VEVENT
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