Item type |
デフォルトアイテムタイプ_(フル)(1) |
公開日 |
2023-03-18 |
タイトル |
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タイトル |
Suzaku view of X-ray Spectral Variability of the Radio Galaxy Centaurus A : Partial Covering Absorber, Reflector, and Possible Jet Component |
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言語 |
en |
作成者 |
Fukazawa, Yasushi
Hiragi, Kazuyoshi
Yamazaki, Syoko
Mizuno, Motohiro
Hayashi, Kazuma
Hayashi, Katsuhiro
Nishino, Sho
Takahashi, Hiromitsu
Ohno, Masanori
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アクセス権 |
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アクセス権 |
open access |
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アクセス権URI |
http://purl.org/coar/access_right/c_abf2 |
権利情報 |
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権利情報 |
(c) 2011. The American Astronomical Society. All rights reserved. |
主題 |
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主題Scheme |
Other |
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主題 |
galaxies: active |
主題 |
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主題Scheme |
Other |
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主題 |
galaxies: individual (Centaurus A) |
主題 |
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主題Scheme |
Other |
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主題 |
galaxies: Seyfert |
主題 |
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主題Scheme |
Other |
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主題 |
X-rays: galaxies |
主題 |
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主題Scheme |
NDC |
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主題 |
440 |
内容記述 |
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内容記述 |
We observed a nearby radio galaxy, Centaurus A (Cen A), three times with Suzaku in 2009 and measured the wide-band X-ray spectral variability more accurately than previous measurements. The Cen A was in an active phase in 2009, and the flux became higher by a factor of 1.5-2.0 and the spectrum became harder than that in 2005. The Fe-K line intensity increased by 20%-30% from 2005 to 2009. The correlation of the count rate between the XIS 3-8 keV and PIN 15-40 keV band showed a complex behavior with a deviation from a linear relation. The wide-band X-ray continuum in 2-200 keV can be fitted with an absorbed power-law model plus a reflection component, or a power law with a partial covering Compton-thick absorption. The difference spectra between high and low flux periods in each observation were reproduced by a power law with a partial covering Compton-thick absorption. Such a Compton-thick partial covering absorber was observed for the first time in Cen A. The power-law photon index of the difference spectra in 2009 is almost the same as that of the time-averaged spectra in 2005, but steeper by similar to 0.2 than that of the time-averaged spectra in 2009. This suggests an additional hard power-law component with a photon index of <1.6 in 2009. This hard component could be a lower part of the inverse-Compton-scattered component from the jet, whose gamma-ray emission has recently been detected with the Fermi Large Area Telescope. |
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言語 |
en |
出版者 |
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出版者 |
IOP Publishing Ltd |
言語 |
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言語 |
eng |
資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
出版タイプ |
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出版タイプ |
VoR |
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出版タイプResource |
http://purl.org/coar/version/c_970fb48d4fbd8a85 |
関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
10.1088/0004-637X/743/2/124 |
関連情報 |
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識別子タイプ |
DOI |
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関連識別子 |
http://dx.doi.org/10.1088/0004-637X/743/2/124 |
収録物識別子 |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0004-637X |
収録物識別子 |
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収録物識別子タイプ |
NCID |
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収録物識別子 |
AA00553242 |
開始ページ |
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開始ページ |
124 |
書誌情報 |
The Astrophysical Journal
The Astrophysical Journal
巻 743,
号 2,
p. 124,
発行日 2011
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旧ID |
34772 |