We compile the multi-band spectral energy distribution ( SED ) of Seyfert 1 galaxy NGC4593 , and investigate its optical-to-ultraviolet ( OUV ) continuum and iron K \alpha line profile .
No strong “ big blue bump ” is found in OUV band .
The iron K \alpha line profile is not as broad as expected from a disk which extends down to the last stable orbit .
Both of them can be modeled by a truncated thin disk , and support the existence of a truncated thin disk in the system .
It is of much interest that NGC4593 may be a typical object with an accretion rate \dot { m } = \dot { M } / M _ { Edd } \sim 0.01 - 0.1 and harbors a two component accretion flow : an outer thin disk and an inner hot flow–possibly ADAF , analogous to the low and intermediate state of low mass X-ray binaries ( LMXB ) .