Astronomy and Astrophysics – Astronomy
Scientific paper
May 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992mnras.256..238z&link_type=abstract
Monthly Notices of the Royal Astronomical Society (ISSN 0035-8711), vol. 256, no. 2, May 15, 1992, p. 238-246.
Astronomy and Astrophysics
Astronomy
29
Emission Spectra, Line Spectra, Luminosity, Quasars, Spectral Line Width, Carbon, Correlation, Least Squares Method, Magnesium, Stellar Magnitude
Scientific paper
The Baldwin relation is examined on the basis of the largest available data set of unbiased complete samples of optically selected quasars. Relations yielded by the least-squares fit of the equivalent width vs absolute magnitude are given. For both lines the slope of the correlation between the equivalent widths and the luminosities is very shallow. In particular, the slope for the C IV line is significantly different from the 'canonical' value for the slope of the Baldwin effect in quasars: EWC IV varies as L1550 exp -(0.3-0.4). The present slope for the C IV line is in agreement with that obtained by Kinney et al. (1990) in their study of the Baldwin effect which was chiefly based on IUE data. The present normalization is about a factor of 2 smaller than theirs. Possible selection effects which may have biased the normalization of the Kinney et al. result are suggested.
Boyle Brian J.
Marano Bruno
Mignoli Marco
Zamorani Gianni
Zitelli Valentina
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