The nature of the extreme X-ray variability in the NLS1 1H 0707-495
The nature of the extreme X-ray variability in the NLS1 1H 0707-495
We examine archival XMM-Newton data on the extremely variable narrow-line Seyfert 1 active galactic nucleus (AGN) 1H 0707-495. We construct fractional excess variance (Fvar) spectra for each epoch, including the recent 2019 observation taken simultaneously with eROSITA. We explore both intrinsic and environmental absorption origins for the variability in different epochs, and examine the effect of the photoionized emission lines from outflowing gas. In particular, we show that the unusual soft variability first detected by eROSITA in 2019 is due to a combination of an obscuration event and strong suppression of the variance at 1 keV by photoionized emission, which makes the variance below 1 keV appear more extreme. We also examine the variability on long time-scales, between observations, and find that it is well described by a combination of intrinsic variability and absorption variability. We suggest that the typical extreme high frequency variability, which 1H 0707-495 is known for, is intrinsic to the source, but the large amplitude, low frequency variability that causes prolonged low-flux intervals is likely dominated by variable low-ionization, low-velocity absorption.
accretion, accretion discs, black hole physics, galaxies: active
1798-1816
Parker, M.L.
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Alston, W.N.
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Härer, L.
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Igo, Z.
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Joyce, A.
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Buisson, Douglas
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Chainakun, P.
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Fabian, A.C.
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Jiang, J.
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Kosec, P.
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Matzeu, G.A.
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Pinto, C.
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Xu, Y.
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Zaidouni, F.
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30 August 2021
Parker, M.L.
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Alston, W.N.
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Härer, L.
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Igo, Z.
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Joyce, A.
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Buisson, Douglas
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Chainakun, P.
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Fabian, A.C.
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Jiang, J.
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Kosec, P.
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Matzeu, G.A.
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Pinto, C.
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Xu, Y.
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Zaidouni, F.
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Parker, M.L., Alston, W.N., Härer, L., Igo, Z., Joyce, A., Buisson, Douglas, Chainakun, P., Fabian, A.C., Jiang, J., Kosec, P., Matzeu, G.A., Pinto, C., Xu, Y. and Zaidouni, F.
(2021)
The nature of the extreme X-ray variability in the NLS1 1H 0707-495.
Monthly Notices of the Royal Astronomical Society, 508 (2), .
(doi:10.1093/mnras/stab2434).
Abstract
We examine archival XMM-Newton data on the extremely variable narrow-line Seyfert 1 active galactic nucleus (AGN) 1H 0707-495. We construct fractional excess variance (Fvar) spectra for each epoch, including the recent 2019 observation taken simultaneously with eROSITA. We explore both intrinsic and environmental absorption origins for the variability in different epochs, and examine the effect of the photoionized emission lines from outflowing gas. In particular, we show that the unusual soft variability first detected by eROSITA in 2019 is due to a combination of an obscuration event and strong suppression of the variance at 1 keV by photoionized emission, which makes the variance below 1 keV appear more extreme. We also examine the variability on long time-scales, between observations, and find that it is well described by a combination of intrinsic variability and absorption variability. We suggest that the typical extreme high frequency variability, which 1H 0707-495 is known for, is intrinsic to the source, but the large amplitude, low frequency variability that causes prolonged low-flux intervals is likely dominated by variable low-ionization, low-velocity absorption.
Text
2108.10167
- Accepted Manuscript
More information
Accepted/In Press date: 23 August 2021
Published date: 30 August 2021
Additional Information:
Funding Information:
We thank the referee for their detailed and constructive feedback. WNA is supported by an ESA research fellowship. JJ acknowledges support from the fellowship of China Postdoctoral Science Foundation (2021M691822), the Tsinghua Shuimu Scholar Program, and the Tsinghua Astrophysics Outstanding Fellowship.
Publisher Copyright:
© 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
Keywords:
accretion, accretion discs, black hole physics, galaxies: active
Identifiers
Local EPrints ID: 453183
URI: http://eprints.soton.ac.uk/id/eprint/453183
ISSN: 1365-2966
PURE UUID: 17ba339f-74f8-4514-bd75-a29c81cff116
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Date deposited: 10 Jan 2022 18:02
Last modified: 16 Mar 2024 15:12
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Contributors
Author:
M.L. Parker
Author:
W.N. Alston
Author:
L. Härer
Author:
Z. Igo
Author:
A. Joyce
Author:
Douglas Buisson
Author:
P. Chainakun
Author:
A.C. Fabian
Author:
J. Jiang
Author:
P. Kosec
Author:
G.A. Matzeu
Author:
C. Pinto
Author:
Y. Xu
Author:
F. Zaidouni
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