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AGN Light Echoes and the Accretion Disc Self-Gravity Limit
Andrew Lobban, Andrew King
Accretion disc theory predicts that an AGN disc becomes self-gravitating and breaks up into stars at an outer radius ~ 12 light-days, with effectively no free paramete…
Exploring accretion disc physics and black hole growth with regular monitoring of ultrafast AGN winds
Ken Pounds, Andrew Lobban, Chris Nixon
15 years of XMM-Newton observations have established that ultra-fast, highly ionized winds are common in radio-quiet AGN. A simple theory of Eddington-limited accretion correctly p…
Detection of a second high velocity component in the highly ionized wind from PG 1211+143
Ken Pounds, Andrew Lobban, James Reeves +1
An extended XMM-Newton observation of the luminous narrow line Seyfert galaxy PG 1211+143 in 2014 has revealed a more complex highly ionized, high velocity outflow. The detection o…
X-ray timing analysis of the quasar PG 1211+143
Andrew Lobban, Simon Vaughan, Ken Pounds +1
We report on a timing analysis of a new ~630ks XMM-Newton observation of the quasar, PG 1211+143. We find a well-defined X-ray power spectrum with a well-detected bend at ~7e-5 Hz,…
The story of Seyfert galaxy RE J2248-511: from intriguingly ultrasoft to unremarkably average
Rhaana Starling, C. Done, C. Jin +7
RE J2248-511 is one of only 14 non-blazar AGN detected in the far ultraviolet by the ROSAT Wide Field Camera implying a large ultrasoft X-ray flux. This soft X-ray excess is strong…