Reverberation mapping

Partial Covering/Occultation, resurgence of anold ideaAlways an appealingalternative to diskreflection, to explaingeneral shapes of AGNspectra and big fluxvariations (e.g. Boller et al1997, 2002)Explains some Galacticblack holes (e.g. Dower,Bradt, Morgan 1982,Brandt et al 1996, Tanaka,Ueda and Boller 2003)Gierlinski & Done 2004 Turner et al 2007The idea resurfaced with a vengeance because of the complex absorbers revealed by new dataGrating spectroscopy points specifically to a wind origin for the gas