Phil Uttley and colleagues show that the rms-flux relation in AGN and XRB implies a non-linear, exponential form for their light curves. The variability process must be multiplicative (not shot-noise).
Higdon et al. use Spitzer observations of a field surveyed by the VLA and Chandra and conclude that optically-invisible radio or X-ray sources are not generally detected at 24 microns implying that they are unobscured AGN.
Jones and DeYoung perform MHD modelling of relic radio bubbles in the ICM and confirm that magnetic fields can stabilise the bubbles giving them lifetimes of 10^8 years.
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