2000ApJ...537L.103L

We compile the multiband spectral energy distribution of Seyfert 1 galaxy NGC 4593 and investigate its optical-to-ultraviolet (OUV) continuum and iron Kα line profile. No strong ``big blue bump'' is found in the OUV band. The iron Kα line profile is not as broad as expected from a disk that extends down to the last stable orbit. Both of them can be modeled by a truncated thin disk, and they support the existence of a truncated thin disk in the system. It is of much interest that NGC 4593 may be a typical object with an accretion rate m{dot}=M{dot}/M_Edd∼0.01-0.1 and harbors a two-component accretion flow: an outer thin disk and an inner hot flow–possibly an advection-dominated accretion flow, analogous to the low and intermediate state of low-mass X-ray binaries.