Ian McHardy

X-ray variability of AGN and relationship to X-ray binaries

I will review the observations of AGN X-ray flux variability, the ways in which the variability is commonly quantified, and the various scaling relationships which attempt to unify the behaviour of accreting black holes of differing mass and accretion rate. I will discuss whether useful scaling relationships occur in other wavebands, eg optical and radio. I will also briefly mention what very fast X-ray spectral variability in binaries, on timescales similar to those on which we typically observe spectral variability in AGN, tells us about the X-ray emission process in accreting black holes as a function of accretion rate.