Multiwavelength variability of high energy AGN: the case of NGC 2110

The structure and energetics of the innermost regions of black holes are still matter of debate. In
particular a lot of the attention is given to the understanding of the surrounding material close to
the black hole, as well as to the connection of the inflowing and the outflowing material in disks,
winds and jets. We have identified the Seyfert galaxy NGC 2110, one of the brightest AGN at hard
X-rays, as an ideal laboratory to investigate both issues through its multi wavelength variability.
On one hand, variable absorption has been measured in the past, in the form of partial covering
material. On the other hand, NGC 2110 might represent a transition object between a radio quiet
and a radio-loud galaxy. Variability has been observed at 8.4 GHz with the VLA (with decrease
of ~40% in flux over 7 years). Here we present the study of the variability properties of NGC2110 at X-rays, Hard X-rays and radio frequencies aimed at testing the connection between the X-ray and radio emission and looking for possible multi frequency time lags.