{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360021393796200832.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1051/0004-6361/202346541"}},{"identifier":{"@type":"URI","@value":"https://www.aanda.org/10.1051/0004-6361/202346541/pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"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>"}],"description":[{"type":"abstract","notation":[{"@value":"<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>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021393796200887","@type":"Researcher","foaf:name":[{"@value":"F. 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