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Long term X-ray intensity variations of Cen X-3
https://jaxa.repo.nii.ac.jp/records/5261
https://jaxa.repo.nii.ac.jp/records/52611b1f940b-d6fa-46d5-8aec-dbca1daa2f17
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
64306022.pdf (613.1 kB)
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| Item type | 会議発表論文 / Conference Paper(1) | |||||||||
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| 公開日 | 2015-03-26 | |||||||||
| タイトル | ||||||||||
| タイトル | Long term X-ray intensity variations of Cen X-3 | |||||||||
| 言語 | en | |||||||||
| 言語 | ||||||||||
| 言語 | eng | |||||||||
| キーワード | ||||||||||
| 言語 | en | |||||||||
| 主題Scheme | Other | |||||||||
| 主題 | Stars : neutron - (Stars :) pulsars : individual : Cen X-3 - X-rays : stars - (Stars :) Binaries : general - X-rays : individual : Cen X-3 - X-rays : binaries | |||||||||
| 資源タイプ | ||||||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_5794 | |||||||||
| 資源タイプ | conference paper | |||||||||
| 著者 |
Paul, Biswajit
× Paul, Biswajit
× Raichur, H.
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| 著者所属（英） | ||||||||||
| en | ||||||||||
| Raman Research Institute | ||||||||||
| 著者所属（英） | ||||||||||
| en | ||||||||||
| Raman Research Institute | ||||||||||
| 出版者 | ||||||||||
| 出版者 | 宇宙航空研究開発機構 | |||||||||
| 出版者（英） | ||||||||||
| 出版者 | Japan Aerospace Exploration Agency (JAXA) | |||||||||
| 書誌情報 |
宇宙航空研究開発機構特別資料 en : JAXA Special Publication: Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop 巻 JAXA-SP-08-014E, p. 102-107, 発行日 2009-02-27 |
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| 会議概要（会議名, 開催地, 会期, 主催者等）（英） | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | Astrophysics with All-Sky X-Ray observations: 3rd International MAXI Workshop (RIKEN, 10-12 June 2008) | |||||||||
| 抄録（英） | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | We have carried out detailed investigations of the long term X-ray flux variations of the high mass X-ray binary pulsar Cen X-3 using archival X-ray data from the Rossi X-ray timing Explorer (RXTE). In the lightcurves of several observations made with the Proportional Counter Array (PCA) and covering a wide range of X-ray intensity, we have detected Quasi Periodic Oscillation (QPO). We have observed a clustering of the QPO peak frequency at 40 and 90 mHz with no dependence of the QPO frequency and occurrence of QPOs on the X-ray intensity. If the observed X-ray intensity of Cen X-3 and its long term variations are related to the mass accretion rate, the lack of QPO frequency variation of Cen X-3 is in contrast with an inner disk origin of the QPOs. Using the same RXTE-PCA observations, we have also measured the pulsed flux of Cen X-3 in different flux states. We found that below a certain flux level, the X-ray lightcurve does not have any pulsations while above this level, the pulsed flux increases linearly with the peak flux. This is consistent with the X-ray emission of Cen X-3 having one unpulsed component and one varying component with a constant pulsed fraction. In the low state, the unpulsed component becomes dominant. The detected X-ray emission in the low state can be due to scattering of X-rays from the stellar wind of the companion star. We have also studied the orbital modulation of the Cen X-3 X-ray lightcurve using the long term X-ray lightcurve made with the All Sky Monitor on board the RXTE. We found an evolution of the orbital modulation of the X-ray lightcurve as a function of the flux state. In high state, the transitions are sharp indicating that most of the observed X-rays are produced in a small region. In the low state, the orbital modulation is smooth, indicating that most of the observed X-rays are produced in an extended region, probably by scattering of X-rays from a hidden central source. The QPO measurements, the pulsed flux measurements and the orbital modulation measurements indicate that the different flux states of Cen X-3 are produced by different degree of absorption. We propose that the absorption is caused by a periodically precessing accretion disk. | |||||||||
| ISSN | ||||||||||
| 収録物識別子タイプ | ISSN | |||||||||
| 収録物識別子 | 1349-113X | |||||||||
| 書誌レコードID | ||||||||||
| 収録物識別子タイプ | NCID | |||||||||
| 収録物識別子 | AA11984031 | |||||||||
| 資料番号 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | 資料番号: AA0064306022 | |||||||||
| レポート番号 | ||||||||||
| 内容記述タイプ | Other | |||||||||
| 内容記述 | レポート番号: JAXA-SP-08-014E | |||||||||
