Is the soft excess in AGN real?

Abstract

We systematically analyse all publicly available XMM-Newton spectra of radio-quiet PG quasars. The soft X-ray excess in these objects is well modelled by an additional, cool, Compton scattering region. However, the remarkably constant temperature derived for this component over the whole sample requires a puzzling fine tuning of the parameters. Instead, we propose that the soft excess is an artifact of strong, relativistically smeared, partially ionized absorption. The strong jump in opacity at ~0.7 keV from OVII, OVIII and iron can lead to an apparent soft excess below this energy, which is trivially constant since it depends on atomic processes. This can have a dramatic effect on the derived spectrum, which has implications for fitting the relativistic smearing of the reflected iron line emission from the disc.

Accepted for publication in MNRAS

References in corpus (12)

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• Radiation mechanisms and geometry of Cygnus X-1 in the soft state
• A high velocity ionised outflow and XUV photosphere in the narrow emission line quasar PG1211+143
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• Multiple X-ray reflection from ionized slabs
• The Nature of the Emission Components in the Quasar/NLS1 PG1211+143

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