Professor Martin Ward martin.ward@durham.ac.uk
External Examiner (PGR)
State-of-the-art AGN SEDs for Photoionization Models: BLR Predictions Confront the Observations
Ward, M.J.; Landt, H.; Jin, C.; Done, C.; Ferland, G.J.
Authors
H. Landt
C. Jin
Professor Christine Done chris.done@durham.ac.uk
Professor
G.J. Ferland
Contributors
Dr Hermine Landt-Wilman hermine.landt@durham.ac.uk
Other
Abstract
The great power offered by photoionization models of Active Galactic Nuclei (AGN) emission line regions has long been mitigated by the fact that very little is known about the spectral energy distribution (SED) between the Lyman limit, where intervening absorption becomes a problem, and 0.3 keV, where soft x-ray observations become possible. The emission lines themselves can, to some degree, be used to probe the SED, but only in the broadest terms. This paper employs a new generation of theoretical SEDs which are internally self-consistent, energy conserving, and tested against observations, to infer properties of the emission-line regions. The SEDs are given as a function of the Eddington ratio, allowing emission-line correlations to be investigated on a fundamental basis. We apply the simplest possible tests, based on the foundations of photoionization theory, to investigate the implications for the geometry of the emission-line region. The SEDs become more far-ultraviolet bright as the Eddington ratio increases, so the equivalent widths of recombination lines should also become larger, an effect which we quantify. The observed lack of correlation between Eddington ratio and equivalent width shows that the cloud covering factor must decrease as Eddington ratio increases. This would be consistent with recent models proposing that the broad-line region is a failed dusty wind off the accretion disc.
Citation
Ward, M., Landt, H., Jin, C., Done, C., & Ferland, G. (2020). State-of-the-art AGN SEDs for Photoionization Models: BLR Predictions Confront the Observations. Monthly Notices of the Royal Astronomical Society, 494(4), 5917-5922. https://doi.org/10.1093/mnras/staa1207
Journal Article Type | Article |
---|---|
Acceptance Date | Apr 16, 2020 |
Online Publication Date | May 5, 2020 |
Publication Date | Jun 30, 2020 |
Deposit Date | May 6, 2020 |
Publicly Available Date | Mar 29, 2024 |
Journal | Monthly Notices of the Royal Astronomical Society |
Print ISSN | 0035-8711 |
Electronic ISSN | 1365-2966 |
Publisher | Royal Astronomical Society |
Peer Reviewed | Peer Reviewed |
Volume | 494 |
Issue | 4 |
Pages | 5917-5922 |
DOI | https://doi.org/10.1093/mnras/staa1207 |
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Accepted Journal Article
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Copyright Statement
This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2020 The Author(s) . Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Published Journal Article
(533 Kb)
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