Probing relativistic effects in the central engine of AGN
  Active Galactic Nuclei (AGN) are perfect laboratories to check General
Relativity (GR) effects by using Broad Line Region (BLR) clouds eclipses to
probe the innermost regions of the accretion disk. A new relativistic X-ray
spectral model for X-ray eclipses is introduced. First we present the different
observables that are involved in X-ray eclipses, including the X-ray emitting
regions size, the emissivity index, the cloud's column density, ionization,
size and velocity, the black hole spin, and the system's inclination. Then we
highlight some theoretical predictions on the observables by using XMM-Newton
simulations, finding that absorption varies depending on the photons' energy
range, being maximum when the approaching side of the X-ray-emitting region is
covered. Finally, we fit our relativistic model to actual XMM-Newton data from
a long observation of the NLS1 galaxy SWIFT J2127.4+5654, and compare our
results with a previous work, in which we addressed the BLR cloud eclipse from
a non-relativistic prespective.
