Spectral Energy Distributions of Type 1 AGN in the COSMOS Survey I - The XMM-COSMOS Sample

TL;DR

This paper presents a comprehensive catalog of spectral energy distributions for 413 X-ray selected type 1 AGN from the COSMOS survey, analyzing their properties across a wide frequency range after various corrections.

Contribution

It provides the first extensive, corrected SED catalog for type 1 AGN in COSMOS, including mean and dispersion SEDs from radio to X-ray frequencies.

Findings

Mean SED characterized from 1.4 GHz to 40 keV.

SED variety largely due to reddening and host galaxy contamination.

All SEDs made publicly available online.

Abstract

The "Cosmic Evolution Survey" (COSMOS) enables the study of the Spectral Energy Distributions (SEDs) of Active Galactic Nuclei (AGN) because of the deep coverage and rich sampling of frequencies from X-ray to radio. Here we present a SED catalog of 413 X-ray (\xmm) selected type 1 (emission line FWHM$>2000$ km s$^{-1}$) AGN with Magellan, SDSS or VLT spectrum. The SEDs are corrected for the Galactic extinction, for broad emission line contributions, constrained variability, and for host galaxy contribution. We present the mean SED and the dispersion SEDs after the above corrections in the rest frame 1.4 GHz to 40 keV, and show examples of the variety of SEDs encountered. In the near-infrared to optical (rest frame $\sim 8\mu m$-- 4000\AA), the photometry is complete for the whole sample and the mean SED is derived from detections only. Reddening and host galaxy contamination could account for a large fraction of the observed SED variety. The SEDs are all available on-line.