A break in the X-ray loudness of Markarian 590: evidence for an AGN spectral state transition?

B. Palit, A. Rozanska, A. G. Markowitz +8

Using decade-long multi-band {\it Swift} observations of the changing-look AGN Markarian 590, we identify a clear break in the dependence of the X-ray loudness parameter $α_{\rm ox…