Dramatic X-ray spectral variability of a Compton-thick type-1 QSO at $z\sim 1$

Torben Simm, Johannes Buchner, Andrea Merloni +6

We report on the discovery of a dramatic X-ray spectral variability event observed in a $z\sim 1$ broad line type-1 QSO. The XMM-Newton spectrum from the year 2000 is characterized…