The rhythm of Fairall 9 - I: Observing the spectral variability with XMM-Newton and NuSTAR
Abstract
We present a multi-epoch X-ray spectral analysis of the Seyfert 1 galaxy Fairall 9. Our analysis shows that Fairall 9 displays unique spectral variability in that its ratio residuals to a simple absorbed power law in the 0.5-10 keV band remain constant with time in spite of large variations in flux. This behavior implies an unchanging source geometry and the same emission processes continuously at work at the timescale probed. With the constraints from NuSTAR on the broad-band spectral shape, it is clear that the soft excess in this source is a superposition of two different processes, one being blurred ionized reflection in the innermost parts of the accretion disk, and the other a continuum component such as spatially distinct Comptonizing region. Alternatively, a more complex primary Comptonization component together with blurred ionized reflection could be responsible.
Additional Information
© 2016 The American Astronomical Society. All rights reserved. Received 2015 July 5; accepted 2016 February 17; published 2016 April 4. We thank the referee for their comments that have helped to improve the clarity of the paper. AL and ACF acknowledge support from ERC Advanced Grant FEEDBACK. CSR thanks the Simons Foundation Fellows Program (US) and the Sackler Fellowship Program (Cambridge) for support. This work made use of data from the NuSTAR mission, a project led by the California Institute of Technology, managed by the Jet Propulsion Laboratory, and funded by the National Aeronautics and Space Administration. This research has made use of the NuSTAR Data Analysis Software (NuSTAR-DAS) jointly developed by the ASI Science Data Center (ASDC, Italy) and the California Institute of Technology (USA). This research has made use of data obtained from the Suzaku satellite, a collaborative mission between the space agencies of Japan (JAXA) and the USA (NASA).Attached Files
Published - apj_821_1_11.pdf
Submitted - 1602.05589v1.pdf
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Additional details
- Eprint ID
- 65482
- Resolver ID
- CaltechAUTHORS:20160318-105917798
- European Research Council (ERC)
- FEEDBACK
- Simons Foundation
- Sackler Fellowship Program (Cambridge)
- NASA/JPL/Caltech
- Created
-
2016-03-18Created from EPrint's datestamp field
- Updated
-
2021-11-10Created from EPrint's last_modified field
- Caltech groups
- NuSTAR, Space Radiation Laboratory
- Other Numbering System Name
- Space Radiation Laboratory
- Other Numbering System Identifier
- 2016-03