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We fit general relativistic, geometrically thin accretion disk models withnon-LTE atmospheres to near simultaneous multiwavelength data of 3C~273,extending from the optical to the far ultraviolet. Our model fits show no fluxdiscontinuity associated with a hydrogen Lyman edge, but they do exhibit aspectral break which qualitatively resembles that seen in the data. This breakarises from relativistic smearing of Lyman emission edges which are producedlocally at tens of gravitational radii in the disk. We discuss the possibleeffects of metal line blanketing on the model spectra, as well as thesubstantial Comptonization required to explain the observed soft X-ray excess.Our best fit accretion disk model underpredicts the near ultraviolet emissionin this source, and also has an optical spectrum which is too red. We discusssome of the remaining physical uncertainties, and suggest in particular that anextension of our models to the slim disk regime and/or including nonzeromagnetic torques across the innermost stable circular orbit may help resolvethese discrepancies.Comment: Accepted for publication in Ap

Non‐LTE, Relativistic Accretion Disk Fits to 3C 273 and the Origin of the Lyman Limit Spectral Break