Links Between Emission Line Properties of AGN and Their X-ray SED Components

Astronomy and Astrophysics – Astronomy

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Scientific paper

We have produced SEDs from 1 micron to 10keV, for a sample of about 50 AGN based on observations with XMM-Newton, including UV points from the optical monitor, and the SDSS. Using detailed spectral fitting techniques, we quantify the contributions from an accretion disc, a hot Compton component, and a power-law, including the effects of absorption. From the optical spectra we measure the principal emission line diagnostics of conditions within the BLR, NLR and the highly ionised regions. By our decomposition of the X-ray to optical continuum into its constituent components, and using correlations with the optical emission lines, we are able to identify the strongest links. From this understanding of how emission lines respond to the separate components of the ionising continuum, we can better explain the wide range of properties from narrowest line Seyfert 1s up to those displaying exceptionally broad emission lines.

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