The Eddington ratio-dependent ‘changing look’ events in NGC 2992

We present an analysis of historical multi-wavelength emission the Changing Look (CL) Active Galactic Nucleus (AGN) in NGC 2992, covering epochs ranging from 1978 to 2021, as well new X-ray and optical spectra. The galaxy presents multiple Seyfert type transitions 2 intermediate-type, losing regaining its H$\alpha$ BEL recurrently. In X-rays, source shows intrinsic variability with absorption corrected luminosity varying by a factor $\sim$ 40. rule out tidal disruption events or variable obscuration causes show that presence flux broad line are directly correlated 2-10 keV (L$_{2-10}$): component disappears at L$_{2-10} \leq 2.6\times10^{42}$\ergcms, this value translates into Eddington ratio ($\lambda_{\rm Edd}$) 1\%. $\lambda_{\rm Edd}$ which occur is same critical there should be state transition between radiatively inefficient accretion flow (RIAF) thin disk, such similarity suggests AGN operating threshold mass rate two modes. find correlation narrow Fe K$\alpha$ Edd}$, anti-correlation full-width half maximum agreement theoretical predictions. Two possible scenarios for compatible our results: either dimming continuum, reduces supply ionising photons available excite gas Broad Line Region (BLR), fading BLR structure itself occurs low not able sustain required cloud disk-wind model.