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We present XMM-Newton RGS observations of the soft X-ray spectrum of NGC4051, and explore their implications for the inner accretion disk and ionizedoutflow in the active galactic nucleus. We fit the soft X-ray excess with arelativistically broadened O VIII recombination spectrum, including the entireline series and recombination continuum. This plus an underlying power lawcontinuum provides a much better fit to the soft X-ray spectrum than a singletemperature or disk blackbody plus power law. The emission line profiles,computed for a Kerr metric around a maximally rotating black hole, reveal asharply peaked disk emissivity law and inner radius smaller than 1.7 R_G. Thespectrum also includes narrow absorption and emission lines from C, N, O, Ne,and Fe in an ionized outflow. Outflow column densities are relatively low anddo not create significant edges in the spectrum. The small amount of absorptionbolsters confidence in the detection of relativistic emission line features.The narrow-line emitter has a large (76%) global covering fraction, leading tostrong forbidden lines and filling in of the resonance absorption lines. Wealso find broad C VI Ly-alpha and very broad O VII emission from the broad-lineregion. The narrow and broad-line regions span large ranges in ionizationparameter, and may arise in a disk outflow. The ionized absorber has a largeionization range which is inconsistent with pressure equilibrium in amultiphase medium. The mass outflow rate exceeds the accretion rate by a factorof one thousand.Comment: 43 pages, 12 figures, Accepted for publication in the Astrophysical  Journa

Relativistic OviiiEmission and Ionized Outflow in NGC 4051 Measured withXMM‐Newton