# The Spectral Energy Distributions of Active Galactic Nuclei

## TL;DR

This paper presents comprehensive spectral energy distributions (SEDs) for 41 active galactic nuclei, covering a broad wavelength range, and demonstrates their effectiveness in estimating photometric redshifts for AGNs up to redshift 6.12.

## Contribution

The study provides broader and higher-resolution AGN SED templates, including 72 Seyfert SEDs, improving photometric redshift accuracy over existing templates.

## Key findings

- Broader wavelength coverage and higher spectral resolution of SED templates.
- SEDs produce comparable or better photometric redshifts than existing models.
- Enhanced spectral coverage improves redshift estimation accuracy.

## Abstract

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 micron, but in some instances wavelength coverage extends into the X-ray, far-infrared and radio. For some 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 Bootes 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.