The Accretion History of AGN: The Spectral Energy Distributions of X-Ray-luminous Active Galactic Nuclei
Kirkpatrick, Allison; Koss, Michael; Boquien, Médéric; Marchesi, Stefano; Trakhtenbrot, Benny; LaMassa, Stephanie; Urry, C. Megan; Kartaltepe, Jeyhan; Cappelluti, Nico; Ananna, Tonima Tasnim; Baloković, Mislav; Sanders, David; Auge, Connor; Treister, Ezequiel; Powell, Meredith; Turner, Tracey Jane; Civano, Francesca; Ghosh, Aritra; Coleman, Brandon; Peca, Alessandro,
United States, Chile, Italy, Israel
Abstract
Spectral energy distributions (SEDs) from X-ray to far-infrared (FIR) wavelengths are presented for a sample of 1246 X-ray-luminous active galactic nuclei (AGNs; L 0.5-10 keV > 1043 erg s-1), with z spec < 1.2, selected from Stripe 82X, COSMOS, and GOODS-N/S. The rest-frame SEDs show a wide spread (~2.5 dex) in the relative strengths of broad continuum features at X-ray, ultraviolet (UV), mid-infrared (MIR), and FIR wavelengths. A linear correlation (log-log slope of 0.7 ± 0.04) is found between L MIR and L X. There is significant scatter in the relation between the L UV and L X owing to heavy obscuration; however, the most luminous and unobscured AGNs show a linear correlation (log-log slope of 0.8 ± 0.06) in the relation above this scatter. The relation between L FIR and L X is predominantly flat, but with decreasing dispersion at L X > 1044 erg s-1. The ratio between the "galaxy-subtracted" bolometric luminosity and the intrinsic L X increases from a factor of ~10 to 70 from log L bol/(erg s-1) = 44.5 to 46.5. Characteristic SED shapes have been determined by grouping AGNs based on relative strengths of the UV and MIR emission. The average L 1μm is constant for the majority of these SED shapes, while AGNs with the strongest UV and MIR emission have elevated L 1μm, consistent with the AGN emission dominating their SEDs at optical and near-infrared wavelengths. A strong correlation is found between the SED shape and both the L X and L bol, such that L bol/L X = 20.4 ± 1.8, independent of the SED shape. This is consistent with an evolutionary scenario of increasing L bol with decreasing obscuration as the AGN blows away circumnuclear gas.