Seminars

Giovedi 25 Gennaio 2018, h. 11:30 
 Aula L. Rosino Dipartimento di Fisica e Astronomia

Alan Garcia

  Universita' di Padova
 

 Balmer emission along the 4DE1 main sequence

Abstract

The quasar main sequence (MS) appears, at the very least, to be a useful tool to organize quasar diversity in large quasar samples. A careful study of the MS is important because it provides a powerful tool to connect observational parameters and physical parameters of quasars. Here we present the results of systematic study of the H$\beta$ line profile in bins of 1000 km s$^{-1}$, over four intervals in FeII prominence. In particular we test which model of the broad H$\beta$ line profile among Lorentz, double Gaussian and a Voigt functions provides the best description as a function of line width and FeII prominence. The quasars with the most prominent emission have been associated with extreme accretion. For these sources we employ the FWHM(H$\beta$) to estimate a redshift-independent bolometric luminosity following a method proposed recently.

 

 

 

 

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