Tatum, MM, Turner, TJ, Miller, L, Reeves, JN, DiLiello, J, Gofford, J, Patrick, A and Clayton, M (2016) The Global Implications of the Hard Excess II: Analysis of the Local population of Radio Quiet AGN. Astrophysical Journal, 818 (1). ISSN 0004-637X

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Active galactic nuclei (AGN) show evidence for reprocessing gas, outflowing from the accreting black hole. The combined effects of absorption and scattering from the circumnuclear material likely explains the `hard excess' of X-ray emission above 20 keV, compared with extrapolation of spectra from lower X-ray energies. In a recent {\it Suzaku} study, we established the ubiquitous hard excess in hard X-ray-selected, radio-quiet type\,1 AGNs to be consistent with reprocessing of the X-ray continuum an ensemble of clouds, located tens to hundreds of gravitational radii from the nuclear black hole. Here we add hard X-ray-selected, type\,2 AGN to extend our original study and show that the gross X-ray spectral properties of the entire local population of radio quiet AGN may be described by a simple unified scheme. We find a broad, continuous distribution of spectral hardness ratio and Fe\,K$\alpha$ equivalent width across all AGN types, which can be reproduced by varying the observer's sightline through a single, simple model cloud ensemble, provided the radiative transfer through the model cloud distribution includes not only photoelectric absorption but also 3D Compton scattering. Variation in other parameters of the cloud distribution, such as column density or ionisation, should be expected between AGN, but such variation is not required to explain the gross X-ray spectral properties.

Item Type: Article
Additional Information: © IOP Publishing; the version of record Tatum, M.M. et al., 2016. THE GLOBAL IMPLICATIONS OF THE HARD EXCESS. II. ANALYSIS OF THE LOCAL POPULATION OF RADIO-QUIET AGNs. The Astrophysical Journal, 818(1), p.12, is available from http://dx.doi.org/10.3847/0004-637x/818/1/12
Uncontrolled Keywords: astrophysics, galaxies, active, galaxies, Seyfert, X-rays
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Faculty of Natural Sciences > School of Physical and Geographical Sciences
Related URLs:
Depositing User: Symplectic
Date Deposited: 09 Dec 2016 12:01
Last Modified: 09 Dec 2016 12:03
URI: https://eprints.keele.ac.uk/id/eprint/2586

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