RE J1034+396: The origin of the soft X-ray excess and QPO (2008)
Middleton, Matthew, Done, Chris, Ward, Martin, Gierlinski, Marek, Schurch, Nick
The X-ray quasi-periodic oscillation (QPO) seen in RE J1034+396 is so far unique amongst AGN. Here we look at the another unique feature of RE J1034+396, namely its huge soft X-ray excess, to see if...
A ~1-hour X-ray periodicity in an active galaxy RE J1034+396 (2008)
Gierlinski, Marek, Middleton, Matthew, Ward, Martin, Done, Chris
Active galactic nuclei and quasars are thought to be scaled up versions of Galactic black hole binaries, powered by accretion onto supermassive black holes with masses of 10^6-10^9 M_Sun, as opposed...
High Energy spectra of Seyferts and Unification schemes (2007)
Middleton, Matthew, Done, Chris, Schurch, Nick
The Unified Model of AGN predicts the sole difference between Seyfert 1 and Seyfert 2 nuclei is the viewing angle with respect to an obscuring structure around the nucleus. High energy photons above...
Black hole spin in GRS 1915+105 (2006)
Middleton, Matthew, Done, Chris, Gierlinski, Marek, Davis, Shane
Microquasars are galactic black hole binary systems with radio jets which can sometimes be spatially resolved to show superluminal motion. The first and best known of this class of objects is GRS...