X-ray spectra reveal the reawakening of the repeat changing-look AGN NGC 1566
Abstract
We present simultaneous XMM–Newton and NuSTAR observations of the repeat changing-look AGN NGC 1566, which dramatically increased in brightness in the IR to X-ray bands in 2018. The broad-band X-ray spectrum was taken at the peak of the outburst and is typical of Seyfert 1 AGN. The spectrum shows a soft excess, Compton hump, warm absorption and reflection, ruling out tidal disruption as the cause of the outburst and demonstrating that a 'standard' accretion disk can develop very rapidly. The high-resolution grating spectrum reveals that the outburst has launched a ∼500 km s^(−1) outflow, and shows photoionized emission lines from rest-frame gas. We discuss possible mechanisms for the outburst, and conclude that it is most likely caused by a disk instability.
Additional Information
© 2018 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. This article is published and distributed under the terms of the Oxford University Press, Standard Journals Publication Model (https://academic.oup.com/journals/pages/open_access/funder_policies/chorus/standard_publication_model). Accepted 2018 November 23. Received 2018 November 13; in original form 2018 October 19. Published: 27 November 2018. MLP is supported by an ESA Research Fellowship. We thank the anonymous referee for detailed and constructive feedback. We thank J. Lewis for editing the manuscript. Based on observations obtained with XMM–Newton, an ESA science mission funded by ESA Member States and NASA, and the NuSTAR mission, a project led by Caltech, managed by JPL, and funded by NASA. This work has been supported by the Deutsche Forschungsgemeinschaft (DFG) grant Ko 857/33-1. We thank the Swift team for carrying out our ToO requests.Attached Files
Published - sly224.pdf
Accepted Version - 1811.10289.pdf
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Additional details
- Eprint ID
- 98432
- Resolver ID
- CaltechAUTHORS:20190905-110449716
- European Space Agency (ESA)
- NASA/JPL/Caltech
- 857/33-1
- Deutsche Forschungsgemeinschaft (DFG)
- Created
-
2019-09-05Created from EPrint's datestamp field
- Updated
-
2021-11-16Created from EPrint's last_modified field
- Caltech groups
- NuSTAR, Space Radiation Laboratory, Astronomy Department