Wilkins, D. R. (2016) Driving extreme variability: Measuring the evolving coronae and evidence for jet launching in AGN. Astronomische Nachrichten, 337 (4-5). pp. 557-562. ISSN 0004-6337. doi:10.1002/asna.201612347. https://resolver.caltech.edu/CaltechAUTHORS:20160527-092024172
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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 Mrk 335 and 1H 0707-495, 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.
Item Type: | Article | |||||||||
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Additional Information: | © 2016 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. | |||||||||
Group: | NuSTAR | |||||||||
Issue or Number: | 4-5 | |||||||||
DOI: | 10.1002/asna.201612347 | |||||||||
Record Number: | CaltechAUTHORS:20160527-092024172 | |||||||||
Persistent URL: | https://resolver.caltech.edu/CaltechAUTHORS:20160527-092024172 | |||||||||
Official Citation: | Wilkins, D. R. (2016), Driving extreme variability: Measuring the evolving coronæ and evidence for jet launching in AGN. Astron. Nachr., 337: 557–562. doi: 10.1002/asna.201612347 | |||||||||
Usage Policy: | No commercial reproduction, distribution, display or performance rights in this work are provided. | |||||||||
ID Code: | 67431 | |||||||||
Collection: | CaltechAUTHORS | |||||||||
Deposited By: | Joy Painter | |||||||||
Deposited On: | 27 May 2016 16:38 | |||||||||
Last Modified: | 11 Nov 2021 00:32 |
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