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The spectral energy distributions of active galactic nuclei

Brown, MJI; Duncan, KJ; Landt, H; Kirk, M; Ricci, C; Kamraj, N; Salvato, M; Ananna, T

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MJI Brown

KJ Duncan

H Landt

M Kirk

C Ricci

N Kamraj

M Salvato

T Ananna



We present spectral energy distributions (SEDs) of 41 active galactic nuclei, derived from multiwavelength photometry and archival spectroscopy. All of the SEDs span at least 0.09 to 30 μm, but in some instances wavelength coverage extends into the X-ray, far-infrared, and radio. For some active galactic nuclei (AGNs) we have fitted the measured far-infrared photometry with greybody models, while radio flux density measurements have been approximated by power laws or polynomials. We have been able to fill some of the gaps in the spectral coverage using interpolation or extrapolation of simple models. In addition to the 41 individual AGN SEDs, we have produced 72 Seyfert SEDs by mixing SEDs of the central regions of Seyferts with galaxy SEDs. Relative to the literature, our templates have broader wavelength coverage and/or higher spectral resolution. We have tested the utility of our SEDs by using them to generate photometric redshifts for 0 < z ≤ 6.12 AGNs in the Boötes field (selected with X-ray, IR, and optical criteria) and, relative to SEDs from the literature, they produce comparable or better photometric redshifts with reduced flux density residuals.


Brown, M., Duncan, K., Landt, H., Kirk, M., Ricci, C., Kamraj, N., …Ananna, T. (2019). The spectral energy distributions of active galactic nuclei. Monthly Notices of the Royal Astronomical Society, 489(3), 3351-3367.

Journal Article Type Article
Acceptance Date Aug 6, 2019
Online Publication Date Aug 30, 2019
Publication Date Nov 30, 2019
Deposit Date Oct 25, 2019
Publicly Available Date Oct 28, 2019
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 489
Issue 3
Article Number 3351
Pages 3351-3367


Published Journal Article (3.7 Mb)

Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2019 The Royal Astronomical Society. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.

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