X-ray polarimetry and spectroscopy of the neutron star low-mass X-ray binary GX 9+9: An in-depth study with IXPE and <i>NuSTAR</i>
書誌事項
- 公開日
- 2023-07-28
- 資源種別
- journal article
- 権利情報
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- https://creativecommons.org/licenses/by/4.0
- DOI
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- 10.1051/0004-6361/202346541
- 公開者
- EDP Sciences
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説明
<jats:p>We report on a comprehensive analysis of simultaneous X-ray polarimetric and spectral data of the bright atoll source GX 9+9 with the Imaging X-ray Polarimetry Explorer (IXPE) and <jats:italic>NuSTAR</jats:italic>. The source is significantly polarized in the 4–8 keV band, with a degree of 2.2% ± 0.5% (uncertainty at the 68% confidence level). The <jats:italic>NuSTAR</jats:italic> broad-band spectrum clearly shows an iron line, and is well described by a model including thermal disc emission, a Comptonized component, and reflection. From a spectro-polarimetric fit, we obtain an upper limit to the polarization degree of the disc of 4% (at the 99% confidence level), while the contribution of Comptonized and reflected radiation cannot be conclusively separated. However, the polarization is consistent with resulting from a combination of Comptonization in a boundary or spreading layer, plus reflection off the disc, which significantly contributes in any realistic scenario.</jats:p>
収録刊行物
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- Astronomy & Astrophysics
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Astronomy & Astrophysics 676 A20-, 2023-07-28
EDP Sciences
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詳細情報 詳細情報について
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- CRID
- 1360021393796200832
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- ISSN
- 14320746
- 00046361
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- 資料種別
- journal article
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- データソース種別
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- Crossref
- KAKEN
