An Explanation for the soft X-ray excess in AGN

Abstract

We present a large sample of type 1 active galactic nuclei (AGN) spectra taken with XMM-Newton, and fit them with both the conventional model (a power law and black body) and the relativistically-blurred photoionized disc reflection model of Ross and Fabian (2005). We find the disc reflection model is a better fit. The disc reflection model successfully reproduces the continuum shape, including the soft excess, of all the sources. The model also reproduces many features that would conventionally be interpreted as absorption edges. We are able to use the model to infer the properties of the sources; specifically that the majority of black holes in the sample are strongly rotating and that there is a deficit in sources with an inclination > 70 degrees. We conclude that the disc reflection model is an important tool in the study of AGN X-ray spectra.

16 pages, MNRAS accepted

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• Untangling the Complex Nature of AGN Variability with Fairall 9
• Modelling the energy dependent X-ray variability of Mrk 335
• On the Relation between the Inclination Angle of the Accretion Disk and the Broad-line Region in Active Galactic Nuclei
• A Monte Carlo Study of the Spectra from Inhomogeneous Accretion Flow
• The unusual spectral energy distribution of LBQS 0102-2713
• The soft X-ray spectrum of PG1211+143
• The Origin of X-ray Emission in the Gamma-ray emitting Narrow-Line Seyfert 1 1H 0323+342
• XMM-Newton and Swift Observations of the Seyfert 1 AGN NGC 5940
• Thermal Comptonization in a changing corona in the changing-look active galaxy NGC 1566
• Quasar continuum spectrum disfavors black holes with a magnetic monopole charge
• The $N_H$ Distribution of Hard X-ray Selected AGN in the NEP Field
• Matter Outflows from AGN: A Unifying Model
• X-ray emission of radio-loud quasar SDSS J121426.52+140258.9: independent variations between optical/UV and X-ray emission
• The extreme properties of the nearby hyper-Eddington accreting Active Galactic Nucleus in IRAS 04416+1215
• Strong gravity effects: X-ray spectra, variability and polarimetry