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Dependence of equivalent width of quasar emission lines on UV-optical spectral index

Published online by Cambridge University Press:  25 July 2014

Olena Torbaniuk  and
Ganna Ivashchenko
Olena Torbaniuk
Affiliation:
Faculty of Physics, Taras Shevchenko National University of Kyiv, Glushkova ave. 4, 03127 Kyiv, Ukraine email: el.torbaniuk@gmail.com Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Akademika Zabolotnoho str. 27, 03680 Kyiv, Ukraine
Ganna Ivashchenko
Affiliation:
Astronomical Observatory, Taras Shevchenko National University of Kyiv, Observatorna str. 3, 04058 Kyiv, Ukraine email: g.ivashchenko@gmail.com Main Astronomical Observatory of the National Academy of Sciences of Ukraine, Akademika Zabolotnoho str. 27, 03680 Kyiv, Ukraine
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Abstract

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Using 192 composite spectra stacked from subsamples of individual SDSS quasar spectra binned in spectral index, αλ, and logarithm of monochromatic luminosity at 1450 Å, log l1450, and modelling separate spectral ranges with superposition of emission lines it was found that: there is a dependence of emission line equivalent width (EW) on αλ (correlation or anti-correlation) for some lines, mostly for those lines for which the Baldwin effect is detected, while for the lines for which the Baldwin effect is not observed any αλ-dependence was found.

Keywords

quasars: emission linesquasars: general

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