Modeling the Hβ Emission Lines in Luminosity-Averaged Quasar Spectra

Details Modeling the Hβ Emission Lines in Luminosity-Averaged Quasar Spectra Modeling the Hβ Emission Lines in Luminosity-Averaged Quasar Spectra

May 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21832712z&link_type=abstract

American Astronomical Society, AAS Meeting #218, #327.12; Bulletin of the American Astronomical Society, Vol. 43, 2011

Astronomy and Astrophysics

Astronomy

1

Scientific paper

We construct median optical spectra of quasars in bins of luminosity. The sample includes bright objects from Sloan Digital Sky Survey (with z<0.7) and sources at intermediate redshift z ≈ 0.9-3.0 observed with VLT ISAAC. The whole sample spans almost six decades in luminosity 43 < log[Lbol (erg s-1)] < 49. We focus our attention to objects that show FWHM (Hβ-broad component) = 4000 - 8000 km s-1 and RFeII = W(FeII 4434-4684)/W(Hβ) less than 0.5. These quasars occupy a restricted domain in the optical plane of the 4D Eigenvector 1 (4DE1) parameter space, which is luminosity independent. We model the total profile of the broad Hβ emission line under the assumption that it requires both a classical broad component (BC) and a redshifted very broad component (VBC). We investigate the properties of the two spectral components as a function of luminosity and report our preliminary results.

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