Continuum and Emission Line Properties of Composite Quasar Spectra from SDSS

Details Continuum and Emission Line Properties of Composite Quasar Spectra from SDSS Continuum and Emission Line Properties of Composite Quasar Spectra from SDSS

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.4504w&link_type=abstract

American Astronomical Society, AAS Meeting #211, #45.04; Bulletin of the American Astronomical Society, Vol. 39, p.796

Astronomy and Astrophysics

Astronomy

Scientific paper

We have calibrated 44,969 quasar spectra in SDSS DR3 database and constructed 149 composite spectra which span 6 orders of magnitude of luminosity and cover redshifts between 0 and 5. The rest-frame spectra cover wavelengths from 610-9007[[Unable to Display Character: ?]]. We have used this unprecedented grid of composite spectra in luminosity and redshift space to investigate general trends of spectral parameters over wide ranges of luminosity and redshift. Each spectrum is fit using a broken power-law, the iron emission forest in both UV and optical bands and the small Balmer bump for continuum, as well as single or multiple Gaussian profiles for emission lines. The spectral slope in the UV (1200-5600[[Unable to Display Character: ?]]) band exhibits strong correlation with luminosity and with redshift. We confirm that the Baldwin effect (BEff) exists in many strong emssion lines, such as MgII2798, CIV1549 and SiIV1396, but not in Balmer emission lines, such as H-beta. The BEff slope is roughly constant, but the amplitude exhibits strong variation over redshift. The equivalent width of MgII2798 also shows redshift evolution. We also find that the mean line-shifts of several emission lines are strongly correlated with luminosity and redshift.

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