An XMM-Newton view of the ‘bare’ nucleus of Fairall 9?
An XMM-Newton view of the ‘bare’ nucleus of Fairall 9?
We present the spectral results from a 130-ks observation, obtained from the X-ray Multi-Mirror Mission–Newton (XMM–Newton) observatory, of the type I Seyfert galaxy Fairall 9. An X-ray hardness ratio analysis of the light curves reveals a ‘softer-when-brighter’ behaviour which is typical of radio-quiet type I Seyfert galaxies. Moreover, we analyse the high spectral resolution data of the reflection grating spectrometer and we do not find any significant evidence supporting the presence of warm absorber in the low X-ray energy part of the source’s spectrum. This means that the central nucleus of Fairall 9 is ‘clean’ and thus its X-ray spectral properties probe directly the physical conditions of the central engine. The overall X-ray spectrum in the 0.5–10 keV energy range, derived from the EPIC data, can be modelled by a relativistically blurred disc reflection model. This spectral model yields for Fairall 9 an intermediate black hole best-fitting spin parameter of ?= 0.39+0.48? 0.30.
1895-1906
Emmanoulopoulos, D.
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Papadakis, I. E.
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Mchardy, I.
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Nicastro, F.
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Bianchi, S.
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Arévalo, P.
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1 August 2011
Emmanoulopoulos, D.
ee2db4c6-3379-4604-8711-f779fb74f538
Papadakis, I. E.
2dbbcb1a-a6a1-4593-b885-2fa598ca8c85
Mchardy, I.
4f215137-9cc4-4a08-982e-772a0b24c17e
Nicastro, F.
46081f33-7d1f-46b4-8577-b996e99963fe
Bianchi, S.
f611d3c2-0331-4982-a46b-c5fdd581c86a
Arévalo, P.
16a262f1-5692-423c-83f4-a61364f9f958
Emmanoulopoulos, D., Papadakis, I. E. and Mchardy, I. et al.
(2011)
An XMM-Newton view of the ‘bare’ nucleus of Fairall 9?
Monthly Notices of the Royal Astronomical Society, 415 (2), .
(doi:10.1111/j.1365-2966.2011.18834.x).
Abstract
We present the spectral results from a 130-ks observation, obtained from the X-ray Multi-Mirror Mission–Newton (XMM–Newton) observatory, of the type I Seyfert galaxy Fairall 9. An X-ray hardness ratio analysis of the light curves reveals a ‘softer-when-brighter’ behaviour which is typical of radio-quiet type I Seyfert galaxies. Moreover, we analyse the high spectral resolution data of the reflection grating spectrometer and we do not find any significant evidence supporting the presence of warm absorber in the low X-ray energy part of the source’s spectrum. This means that the central nucleus of Fairall 9 is ‘clean’ and thus its X-ray spectral properties probe directly the physical conditions of the central engine. The overall X-ray spectrum in the 0.5–10 keV energy range, derived from the EPIC data, can be modelled by a relativistically blurred disc reflection model. This spectral model yields for Fairall 9 an intermediate black hole best-fitting spin parameter of ?= 0.39+0.48? 0.30.
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Accepted/In Press date: 31 March 2011
Published date: 1 August 2011
Organisations:
Astronomy Group
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Local EPrints ID: 401576
URI: http://eprints.soton.ac.uk/id/eprint/401576
ISSN: 1365-2966
PURE UUID: 337e35be-96bb-4f89-8c69-f4fa05b02640
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Date deposited: 27 Oct 2016 10:45
Last modified: 15 Mar 2024 02:50
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Contributors
Author:
D. Emmanoulopoulos
Author:
I. E. Papadakis
Author:
I. Mchardy
Author:
F. Nicastro
Author:
S. Bianchi
Author:
P. Arévalo
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