| Abstract: The bolometric luminosity of active galactic nuclei (AGNs) is a key tracer of accretion physics, but its direct determination is often hindered by limited spectral coverage and contamination of the host galaxy. Bolometric corrections (BC) offer a practical means of estimating bolometric luminosity, with the X-ray bolometric correction being crucial for exploring the coupling between the accretion disk and the X-ray corona. Using multi-epoch, multi-wavelength observations of five highly variable, changing-look AGNs that span more than three orders of magnitude in Eddington ratio, we present the most accurate estimataion bolometric correction. Our unique data set reveals a remarkably tight relation between BC and Eddington ratio, with an intrinsic scatter of only ~0.05 dex, which was not previously achived. Our results shows that the Eddington ratio, not luminosity, is the primary driver of AGN physics. Our results highlight how time-domain, multi-wavelength observations of variable AGN offer unique insights into the accretion flow structure and its radiative output. |
