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Article: Highly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1

TitleHighly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1
Authors
Issue Date1-Jan-2024
PublisherAmerican Astronomical Society
Citation
Astrophysical Journal Letters, 2024, v. 960, n. 2, p. 1-15 How to Cite?
AbstractThe Imaging X-ray Polarimetry Explorer measured with high significance the X-ray polarization of the brightest Z-source, Sco X-1, resulting in the nominal 2-8 keV energy band in a polarization degree of 1.0% +/- 0.2% and a polarization angle of 8(degrees) +/- 6(degrees) at a 90% confidence level. This observation was strictly simultaneous with observations performed by NICER, NuSTAR, and Insight-HXMT, which allowed for a precise characterization of its broadband spectrum from soft to hard X-rays. The source has been observed mainly in its soft state, with short periods of flaring. We also observed low-frequency quasiperiodic oscillations. From a spectropolarimetric analysis, we associate a polarization to the accretion disk at <3.2% at 90% confidence level, compatible with expectations for an electron scattering dominated optically thick atmosphere at the Sco X-1 inclination of similar to 44(degrees) ; for the higher-energy Comptonized component, we obtain a polarization of 1.3% +/- 0.4%, in agreement with expectations for a slab of Thomson optical depth of similar to 7 and an electron temperature of similar to 3 keV. A polarization rotation with respect to previous observations by OSO-8 and PolarLight, and also with respect to the radio-jet position angle, is observed. This result may indicate a variation of the polarization with the source state that can be related to relativistic precession or a change in the corona geometry with the accretion flow.
Persistent Identifierhttp://hdl.handle.net/10722/340787
ISSN
2023 Impact Factor: 8.8
2023 SCImago Journal Rankings: 2.766
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorLa Monaca, F-
dc.contributor.authorDi Marco, A-
dc.contributor.authorPoutanen, J-
dc.contributor.authorBachetti, M-
dc.contributor.authorMotta, SE-
dc.contributor.authorPapitto, A-
dc.contributor.authorPilia, M-
dc.contributor.authorXie, F-
dc.contributor.authorBianchi, S-
dc.contributor.authorBobrikova, A-
dc.contributor.authorCosta, E-
dc.contributor.authorDeng, W-
dc.contributor.authorGe, MY-
dc.contributor.authorIlliano, G-
dc.contributor.authorJia, SM-
dc.contributor.authorKrawczynski, H-
dc.contributor.authorLai, EV-
dc.contributor.authorLiu, K-
dc.contributor.authorMastroserio, G-
dc.contributor.authorMuleri, F-
dc.contributor.authorRankin, J-
dc.contributor.authorSoffitta, P-
dc.contributor.authorVeledina, A-
dc.contributor.authorAmbrosino, F-
dc.contributor.authorDel Santo, M-
dc.contributor.authorChen, W-
dc.contributor.authorGarcia, JA-
dc.contributor.authorKaaret, P-
dc.contributor.authorRussell, TD-
dc.contributor.authorWei, WH-
dc.contributor.authorZhang, SN-
dc.contributor.authorZuo, C-
dc.contributor.authorArzoumanian, Z-
dc.contributor.authorCocchi, M-
dc.contributor.authorGnarini, A-
dc.contributor.authorFarinelli, R-
dc.contributor.authorGendreau, K-
dc.contributor.authorUrsini, F-
dc.contributor.authorWeisskopf, MC-
dc.contributor.authorZane, S-
dc.contributor.authorAgudo, I-
dc.contributor.authorAntonelli, LA-
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.authorCapitanio, F-
dc.contributor.authorCastellano, S-
dc.contributor.authorCavazzuti, E-
dc.contributor.authorChen, CT-
dc.contributor.authorCiprini, S-
dc.contributor.authorDe Rosa, A-
dc.contributor.authorDel Monte, E-
dc.contributor.authorDi Gesu, L-
dc.contributor.authorDi Lalla, N-
dc.contributor.authorDonnarumma, I-
dc.contributor.authorDoroshenko, V-
dc.contributor.authorDovciak, M-
dc.contributor.authorEhlert, SR-
dc.contributor.authorEnoto, T-
dc.contributor.authorEvangelista, Y-
dc.contributor.authorFabiani, S-
dc.contributor.authorFerrazzoli, R-
dc.contributor.authorGunji, S-
dc.contributor.authorHayashida, K-
dc.contributor.authorHeyl, J-
dc.contributor.authorIwakiri, W-
dc.contributor.authorJorstad, SG-
dc.contributor.authorKaras, V-
dc.contributor.authorKislat, F-
dc.contributor.authorKitaguchi, T-
dc.contributor.authorKolodziejczak, JJ-
dc.contributor.authorLatronico, L-
dc.contributor.authorLiodakis, I-
dc.contributor.authorMaldera, S-
dc.contributor.authorManfreda, A-
dc.contributor.authorMarin, F-
dc.contributor.authorMarinucci, A-
dc.contributor.authorMarscher, AP-
dc.contributor.authorMarshall, HL-
dc.contributor.authorMassaro, F-
dc.contributor.authorMatt, G-
dc.contributor.authorMitsuishi, I-
dc.contributor.authorMizuno, T-
dc.contributor.authorNegro, M-
dc.contributor.authorNg, CY-
dc.contributor.authorO'Dell, SL-
dc.contributor.authorOmodei, N-
dc.contributor.authorOppedisano, C-
dc.contributor.authorPavlov, GG-
dc.contributor.authorPeirson, AL-
dc.contributor.authorPerri, M-
dc.contributor.authorPesce-Rollins, M-
dc.contributor.authorPetrucci, PO-
dc.contributor.authorPossenti, A-
dc.contributor.authorPuccetti, S-
dc.contributor.authorRamsey, BD-
dc.contributor.authorRatheesh, A-
dc.contributor.authorRoberts, OJ-
dc.contributor.authorRomani, RW-
dc.contributor.authorSgrò, C-
dc.contributor.authorSlane, P-
dc.contributor.authorSpandre, G-
dc.contributor.authorSwartz, DA-
dc.contributor.authorTamagawa, T-
dc.contributor.authorTavecchio, F-
dc.contributor.authorTaverna, R-
dc.contributor.authorTawara, Y-
dc.contributor.authorTennant, AF-
dc.contributor.authorThomas, NE-
dc.contributor.authorTombesi, F-
dc.contributor.authorTrois, A-
dc.contributor.authorTsygankov, SS-
dc.contributor.authorTurolla, R-
dc.contributor.authorVink, J-
dc.contributor.authorWu, K-
dc.date.accessioned2024-03-11T10:47:07Z-
dc.date.available2024-03-11T10:47:07Z-
dc.date.issued2024-01-01-
dc.identifier.citationAstrophysical Journal Letters, 2024, v. 960, n. 2, p. 1-15-
dc.identifier.issn2041-8205-
dc.identifier.urihttp://hdl.handle.net/10722/340787-
dc.description.abstractThe Imaging X-ray Polarimetry Explorer measured with high significance the X-ray polarization of the brightest Z-source, Sco X-1, resulting in the nominal 2-8 keV energy band in a polarization degree of 1.0% +/- 0.2% and a polarization angle of 8(degrees) +/- 6(degrees) at a 90% confidence level. This observation was strictly simultaneous with observations performed by NICER, NuSTAR, and Insight-HXMT, which allowed for a precise characterization of its broadband spectrum from soft to hard X-rays. The source has been observed mainly in its soft state, with short periods of flaring. We also observed low-frequency quasiperiodic oscillations. From a spectropolarimetric analysis, we associate a polarization to the accretion disk at <3.2% at 90% confidence level, compatible with expectations for an electron scattering dominated optically thick atmosphere at the Sco X-1 inclination of similar to 44(degrees) ; for the higher-energy Comptonized component, we obtain a polarization of 1.3% +/- 0.4%, in agreement with expectations for a slab of Thomson optical depth of similar to 7 and an electron temperature of similar to 3 keV. A polarization rotation with respect to previous observations by OSO-8 and PolarLight, and also with respect to the radio-jet position angle, is observed. This result may indicate a variation of the polarization with the source state that can be related to relativistic precession or a change in the corona geometry with the accretion flow.-
dc.languageeng-
dc.publisherAmerican Astronomical Society-
dc.relation.ispartofAstrophysical Journal Letters-
dc.rightsThis work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.-
dc.titleHighly Significant Detection of X-Ray Polarization from the Brightest Accreting Neutron Star Sco X-1-
dc.typeArticle-
dc.description.naturepublished_or_final_version-
dc.identifier.doi10.3847/2041-8213/ad132d-
dc.identifier.scopuseid_2-s2.0-85182388102-
dc.identifier.volume960-
dc.identifier.issue2-
dc.identifier.spage1-
dc.identifier.epage15-
dc.identifier.eissn2041-8213-
dc.identifier.isiWOS:001137090300001-
dc.publisher.placeBRISTOL-
dc.identifier.issnl2041-8205-

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