Title: Unveiling AGN Accretion Properties Through SED Fitting
Abstract: The spectral energy distribution (SED) of active galactic nuclei (AGNs) provides crucial insights into their physical properties and accretion processes. AGN SEDs span a broad wavelength range, from radio to X-ray, with different components originating from distinct physical regions: the synchrotron emission from jets in radio bands, the thermal emission from the accretion disk in the optical and ultraviolet (UV), the inverse Compton scattering in the X-ray from the hot corona, and the infrared (IR) emission from dust torus. Understanding the shape and variability of AGN SEDs is essential for constraining black hole accretion and emission mechanisms. In this talk, I will introduce the principles of AGN SED fitting, including commonly used fitting packages and the key physical parameters that can be derived, such as bolometric luminosity, accretion rate, and Eddington ratio. I will also discuss some scientific usage of SED fitting, particularly in changing-look AGNs (CLAGNs). Through this discussion, I aim to highlight how SED fitting serves as a powerful tool for understanding AGN physics and evolution.
