The strength of optical Fe II emission in quasi-stellar objects

Details The strength of optical Fe II emission in quasi-stellar objects The strength of optical Fe II emission in quasi-stellar objects

Apr 1990

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990apj...353..433z&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 353, April 20, 1990, p. 433-437. Research supported by SERC.

Astronomy and Astrophysics

Astrophysics

46

Emission Spectra, Metallicity, Quasars, Spectral Line Width, Visible Spectrum, Iron, Light Emission, Lyman Alpha Radiation

Scientific paper

Based on optical data for a sample of 33 QSOs taken from Wilkes and Elvis (1987) a study is made of the relation between the strength of optical Fe II emission, the line widths, and the soft X-ray spectrum. The previously claimed relation that objects with flat soft X-ray spectra have weak optical Fe II emission is not present for this sample. A strong relation exists that objects with strong optical Fe II emission have narrow H-beta lines. This trend is weaker with Ly-alpha. These relations may be understood if the Fe II line emission is formed in a special zone and has a stronger aspect dependence than the underlying optical continuum.

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