Astronomy and Astrophysics – Astronomy
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992xrea.conf..408m&link_type=abstract
In MPI für Extraterrestrische Physik, X Ray Emission from Active Galactic Nuclei and the Cosmic X Ray Background p 408-413 (SEE
Astronomy and Astrophysics
Astronomy
Correlation, Line Spectra, Luminous Intensity, Quasars, Radio Astronomy, Radio Spectra, Spectral Line Width, Variability, Width
Scientific paper
From an analysis of the Baldwin effect in five complete optically selected samples of quasars, it was found that the slope of the correlation between equivalent width and absolute luminosity is very shallow. In particular, it was found that EWCIV is proportional to L1550-0.13, significantly different from the previous 'canonical' slope of the Baldwin effect in quasars: EWCIV proportional to L1550(exp(0.3 to 0.4)). While the data set is composed of optically selected quasars, the latter result was mainly based on the analysis of flat spectrum, radio loud quasars. It is likely that the enhanced optical variability of radio loud quasars may be the fundamental factor in producing the observed difference between the two correlations. Considering also the relatively large dispersion of the data, it was concluded that the equivalent width of the CIV line can not be used as a reliable luminosity indicator in quasars.
Boyle Brian J.
Marano Bruno
Mignoli Marco
Zamorani Giovanni
Zitelli Valentina
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