Astronomy and Astrophysics – Astronomy
Scientific paper
Aug 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...343l...9b&link_type=abstract
Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X), vol. 343, Aug. 1, 1989, p. L9-L12.
Astronomy and Astrophysics
Astronomy
23
Emission Spectra, Iron, Quasars, X Ray Astronomy, Astronomical Spectroscopy, Radio Spectra, Red Shift, Spectral Line Width
Scientific paper
The claim that the equivalent width of the optical Fe II emission complexes and the soft X-ray slopes of quasars are related is examined. It is shown that among radio-loud quasars, flat radio spectrum objects have flatter soft X-ray slopes. This places steep radio spectrum quasars intermediate in their X-ray slopes between flat radio spectrum and radio-quiet objects. This information may be combined with the observation that steep radio spectrum quasars have weaker Fe II emission to suggest that no correlation between Fe II emission and X-ray spectral slope is expected. An analysis of 15 objects with homogeneously measured Fe II emission strengths and X-ray spectral slopes confirms this prediction.
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