Astronomy and Astrophysics – Astrophysics
Scientific paper
2003-06-09
Astrophys.J. 590 (2003) 73-85
Astronomy and Astrophysics
Astrophysics
ApJ in press, 7 figures included
Scientific paper
10.1086/374978
This work studies the optical emission line properties of a sample of 155 low-redshift bright X-ray selected ROSAT Seyfert~1 type AGN for which adequate signal-to-noise ratio spectroscopic observations are available. We measured emission line properties by performing multi-component fits to the emission line profiles, covering the effect of blended iron emission. We also obtained continuum parameters, including 250eV X-ray luminosities derived from the ROSAT database. In addition, the measured properties are gathered for a correlation analysis, which confirms the well-known relations between the strengths of Fe~II, [O III] emission and the X-ray slope. We also detect striking correlations between H$\beta$ redshift (or blueshift), flux ratios of Fe `II to H$\beta$ broad component and [O III] to H$\beta$ narrow component. These trends are most likely driven by the Eddington ratio.
Komossa Stefanie
Qian Yachao
Wei Jian-Yan
Xu D.-W.
Zheng Xian Zhong
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