Astronomy and Astrophysics – Astronomy
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.2006z&link_type=abstract
American Astronomical Society, AAS Meeting #212, #20.06; Bulletin of the American Astronomical Society, Vol. 40, p.217
Astronomy and Astrophysics
Astronomy
Scientific paper
We present composite spectra for the region of Hβ and nearby FeII blends using a sample of the 450+ brightest SDSS (DR5) quasars within z=0.7. Very high S/N median composite spectra are generated by binning the optical plane FWHM Hβ vs. RFeII = EW (FeII4570blend) / EW (Hβ) of the 4DE1 parameter space. Bins isolate quasars with statistically indistinguishable spectra. The median spectra emphasize differences along the sequence of principal occupation in that plane including: 1) systematically increasing FWHM Hβ, 2) systematically decreasing RFeII. We confirm a previously reported transition from Lorentzian to a double Gaussian profile taking place respectively below and above FWHM (Hβ) = 4000 km/s. This provides further empirical support for the existence of two QSO populations. Additionally, we compare composite/median spectra of Radio-Loud and Radio-Quiet quasars with statistically similar location within 4DE1 optical plane.
Marziani Paola
Sulentic Jack W.
Zamfir Sebastian
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