%0 Generic %1 citeulike:13832748 %A Wilkins, D. R. %D 2015 %K imported %T Driving Extreme Variability - Measuring the evolving coronae and evidence for jet launching in AGN %U http://arxiv.org/abs/1511.01090 %X Relativistically blurred reflection from the accretion disc provides a powerful probe of the extreme environments close to supermassive black holes; the inner regions of the accretion flow and the corona that produces the intense X-ray continuum. Techniques by which the geometry and extent of the corona can be measured through the observed X-ray spectrum are reviewed along with the evolution in the structure of the corona that is seen to accompany variations in the X-ray luminosity both on long and short timescales. Detailed analyses of the narrow line Seyfert 1 galaxies Markarian 335 and 1H0707-495, over observations with XMM-Newton as well as Suzaku and NuSTAR spanning nearly a decade reveal that increases in the X-ray luminosity coincide with an expansion of the corona to cover a larger area of the inner accretion disc. Underlying this long timescale variability lie more complex patterns of behaviour on short timescales. Flares in the X-ray emission during a low flux state of Mrk 335 observed in 2013 and 2014 are found to mark a reconfiguration of the corona while there is evidence that the flares were caused by a vertical collimation and ejection of coronal material, reminiscent of an aborted jet-launching event. Measurements of the corona and reflecting accretion disc are combined to infer the conditions on the inner disc that lead to the flaring event.

@misc{citeulike:13832748, abstract = {{Relativistically blurred reflection from the accretion disc provides a powerful probe of the extreme environments close to supermassive black holes; the inner regions of the accretion flow and the corona that produces the intense X-ray continuum. Techniques by which the geometry and extent of the corona can be measured through the observed X-ray spectrum are reviewed along with the evolution in the structure of the corona that is seen to accompany variations in the X-ray luminosity both on long and short timescales. Detailed analyses of the narrow line Seyfert 1 galaxies Markarian 335 and 1H0707-495, over observations with XMM-Newton as well as Suzaku and NuSTAR spanning nearly a decade reveal that increases in the X-ray luminosity coincide with an expansion of the corona to cover a larger area of the inner accretion disc. Underlying this long timescale variability lie more complex patterns of behaviour on short timescales. Flares in the X-ray emission during a low flux state of Mrk 335 observed in 2013 and 2014 are found to mark a reconfiguration of the corona while there is evidence that the flares were caused by a vertical collimation and ejection of coronal material, reminiscent of an aborted jet-launching event. Measurements of the corona and reflecting accretion disc are combined to infer the conditions on the inner disc that lead to the flaring event.}}, added-at = {2019-03-25T08:20:55.000+0100}, archiveprefix = {arXiv}, author = {Wilkins, D. R.}, biburl = {https://www.bibsonomy.org/bibtex/280881737a6ea03ddc0ffccbcd4f9f55d/ericblackman}, citeulike-article-id = {13832748}, citeulike-linkout-0 = {http://arxiv.org/abs/1511.01090}, citeulike-linkout-1 = {http://arxiv.org/pdf/1511.01090}, day = 3, eprint = {1511.01090}, interhash = {0d031c8da277efff1449d16f32927b3f}, intrahash = {80881737a6ea03ddc0ffccbcd4f9f55d}, keywords = {imported}, month = nov, posted-at = {2015-11-07 08:01:15}, priority = {2}, timestamp = {2019-03-25T08:20:55.000+0100}, title = {{Driving Extreme Variability - Measuring the evolving coronae and evidence for jet launching in AGN}}, url = {http://arxiv.org/abs/1511.01090}, year = 2015 }