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Article: X-ray polarimetry and spectroscopy of the neutron star low-mass X-ray binary GX 9+9: An in-depth study with IXPE and NuSTAR

TitleX-ray polarimetry and spectroscopy of the neutron star low-mass X-ray binary GX 9+9: An in-depth study with IXPE and NuSTAR
Authors
Issue Date28-Jul-2023
PublisherEDP Sciences
Citation
Astronomy & Astrophysics, 2023, v. 676, p. 1-10 How to Cite?
AbstractWe 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 NuSTAR. The source is significantly polarized in the 4-8 keV band, with a degree of 2.2%  & PLUSMN;  0.5% (uncertainty at the 68% confidence level). The NuSTAR 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.
Persistent Identifierhttp://hdl.handle.net/10722/331811
ISSN
2023 Impact Factor: 5.4
2023 SCImago Journal Rankings: 1.896
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorUrsini, F-
dc.contributor.authorFarinelli, R-
dc.contributor.authorGnarini, A-
dc.contributor.authorPoutanen, J-
dc.contributor.authorBianchi, S-
dc.contributor.authorCapitanio, F-
dc.contributor.authorDi Marco, A-
dc.contributor.authorFabiani, S-
dc.contributor.authorLa Monaca, F-
dc.contributor.authorMalacaria, C-
dc.contributor.authorMatt, G-
dc.contributor.authorMikusincova, R-
dc.contributor.authorCocchi, M-
dc.contributor.authorKaaret, P-
dc.contributor.authorKajava, JJE-
dc.contributor.authorPilia, M-
dc.contributor.authorZhang, W-
dc.contributor.authorAgudo, I-
dc.contributor.authorAntonelli, LA-
dc.contributor.authorBachetti, M-
dc.contributor.authorBaldini, L-
dc.contributor.authorBaumgartner, WH-
dc.contributor.authorBellazzini, R-
dc.contributor.authorBongiorno, SD-
dc.contributor.authorBonino, R-
dc.contributor.authorBrez, A-
dc.contributor.authorBucciantini, N-
dc.contributor.authorCastellano, S-
dc.contributor.authorCavazzuti, E-
dc.contributor.authorChen, CT-
dc.contributor.authorCiprini, S-
dc.contributor.authorNg, CY-
dc.contributor.authoret al-
dc.date.accessioned2023-09-21T06:59:08Z-
dc.date.available2023-09-21T06:59:08Z-
dc.date.issued2023-07-28-
dc.identifier.citationAstronomy & Astrophysics, 2023, v. 676, p. 1-10-
dc.identifier.issn0004-6361-
dc.identifier.urihttp://hdl.handle.net/10722/331811-
dc.description.abstractWe 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 NuSTAR. The source is significantly polarized in the 4-8 keV band, with a degree of 2.2%  & PLUSMN;  0.5% (uncertainty at the 68% confidence level). The NuSTAR 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.-
dc.languageeng-
dc.publisherEDP Sciences-
dc.relation.ispartofAstronomy & Astrophysics-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleX-ray polarimetry and spectroscopy of the neutron star low-mass X-ray binary GX 9+9: An in-depth study with IXPE and NuSTAR-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.1051/0004-6361/202346541-
dc.identifier.volume676-
dc.identifier.spage1-
dc.identifier.epage10-
dc.identifier.eissn1432-0746-
dc.identifier.isiWOS:001041583900002-
dc.publisher.placeLES ULIS CEDEX A-
dc.identifier.issnl0004-6361-

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