2023ApJ...957...19A

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.