IXPE observation confirms a high spin in the accreting black hole 4U 1957+115

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dc.contributor.authorMarra L.
dc.contributor.authorBrigitte M.
dc.contributor.authorCavero N.R.
dc.contributor.authorChun S.
dc.contributor.authorSteiner J.F.
dc.contributor.authorDovčiak M.
dc.contributor.authorNowak M.
dc.contributor.authorBianchi S.
dc.contributor.authorCapitanio F.
dc.contributor.authorIngram A.
dc.contributor.authorMatt G.
dc.contributor.authorMuleri F.
dc.contributor.authorPodgorný J.
dc.contributor.authorPoutanen J.
dc.contributor.authorSvoboda J.
dc.contributor.authorTaverna R.
dc.contributor.authorUrsini F.
dc.contributor.authorVeledina A.
dc.contributor.authorDe Rosa A.
dc.contributor.authorGarcía J.A.
dc.contributor.authorLutovinov A.A.
dc.contributor.authorMereminskiy I.A.
dc.contributor.authorFarinelli R.
dc.contributor.authorGunji S.
dc.contributor.authorKaaret P.
dc.contributor.authorKallman T.
dc.contributor.authorKrawczynski H.
dc.contributor.authorKan Y.
dc.contributor.authorHu K.
dc.contributor.authorMarinucci A.
dc.contributor.authorMastroserio G.
dc.contributor.authorMikus̆incová R.
dc.contributor.authorParra M.
dc.contributor.authorPetrucci P.O.
dc.contributor.authorRatheesh A.
dc.contributor.authorSoffitta P.
dc.contributor.authorTombesi F.
dc.contributor.authorZane S.
dc.contributor.authorAgudo I.
dc.contributor.authorAntonelli L.A.
dc.contributor.authorBachetti M.
dc.contributor.authorBaldini L.
dc.contributor.authorBaumgartner W.H.
dc.contributor.authorBellazzini R.
dc.contributor.authorBongiorno S.D.
dc.contributor.authorBonino R.
dc.contributor.authorBrez A.
dc.contributor.authorBucciantini N.
dc.contributor.authorCastellano S.
dc.contributor.authorCavazzuti E.
dc.contributor.authorChen C.
dc.contributor.authorCiprini S.
dc.contributor.authorCosta E.
dc.contributor.authorDel Monte E.
dc.contributor.authorDi Gesu L.
dc.contributor.authorDi Lalla N.
dc.contributor.authorDi Marco A.
dc.contributor.authorDonnarumma I.
dc.contributor.authorDoroshenko V.
dc.contributor.authorEhlert S.R.
dc.contributor.authorEnoto T.
dc.contributor.authorEvangelista Y.
dc.contributor.authorFabiani S.
dc.contributor.authorFerrazzoli R.
dc.contributor.authorHayashida K.
dc.contributor.authorHeyl J.
dc.contributor.authorIwakiri W.
dc.contributor.authorJorstad S.G.
dc.contributor.authorKaras V.
dc.contributor.authorKislat F.
dc.contributor.authorKitaguchi T.
dc.contributor.authorKolodziejczak J.J.
dc.contributor.authorLa Monaca F.
dc.contributor.authorLatronico L.
dc.contributor.authorLiodakis I.
dc.contributor.authorMaldera S.
dc.contributor.authorManfreda A.
dc.contributor.authorMarin F.
dc.contributor.authorMarscher A.P.
dc.contributor.authorMarshall H.L.
dc.contributor.authorMassaro F.
dc.contributor.authorMitsuishi I.
dc.contributor.authorMizuno T.
dc.contributor.authorNegro M.
dc.contributor.authorNg C.Y.
dc.contributor.authorO’Dell S.L.
dc.contributor.authorOmodei N.
dc.contributor.authorOppedisano C.
dc.contributor.authorPapitto A.
dc.contributor.authorPavlov G.G.
dc.contributor.authorPeirson A.L.
dc.contributor.authorPerri M.
dc.contributor.authorPesce-Rollins M.
dc.contributor.authorPilia M.
dc.contributor.authorPossenti A.
dc.contributor.authorPuccetti S.
dc.contributor.authorRamsey B.D.
dc.contributor.authorRankin J.
dc.contributor.authorRoberts O.J.
dc.contributor.authorRomani R.W.
dc.contributor.authorSgrò C.
dc.contributor.authorSlane P.
dc.contributor.authorSpandre G.
dc.contributor.authorSwartz D.A.
dc.contributor.authorTamagawa T.
dc.contributor.authorTavecchio F.
dc.contributor.authorTawara Y.
dc.contributor.authorTennant A.F.
dc.contributor.authorThomas N.E.
dc.contributor.authorTrois A.
dc.contributor.authorTsygankov S.S.
dc.contributor.authorTurolla R.
dc.contributor.authorVink J.
dc.contributor.authorWeisskopf M.C.
dc.contributor.authorWu K.
dc.contributor.authorXie F.
dc.contributor.organizationfi=Tuorlan observatorio|en=Tuorla Observatory|
dc.contributor.organization-code1.2.246.10.2458963.20.90670098848
dc.converis.publication-id393482491
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/393482491
dc.date.accessioned2025-08-27T21:31:51Z
dc.date.available2025-08-27T21:31:51Z
dc.description.abstractWe present the results of the first X-ray polarimetric observation of the low-mass X-ray binary 4U 1957+115, performed with the Imaging X-ray Polarimetry Explorer in May 2023. The binary system has been in a high-soft spectral state since its discovery and is thought to host a black hole. The ∼571 ks observation reveals a linear polarisation degree of 1.9% ± 0.6% and a polarisation angle of −41◦. 8 ± 7◦. 9 in the 2–8 keV energy range. Spectral modelling is consistent with the dominant contribution coming from the standard accretion disc, while polarimetric data suggest a significant role of returning radiation: photons that are bent by strong gravity effects and forced to return to the disc surface, where they can be reflected before eventually reaching the observer. In this setting, we find that models with a black hole spin lower than 0.96 and an inclination lower than 50◦ are disfavoured.
dc.identifier.jour-issn0004-6361
dc.identifier.olddbid200562
dc.identifier.oldhandle10024/183589
dc.identifier.urihttps://www.utupub.fi/handle/11111/45632
dc.identifier.urlhttps://doi.org/10.1051/0004-6361/202348277
dc.identifier.urnURN:NBN:fi-fe2025082785048
dc.language.isoen
dc.okm.affiliatedauthorPoutanen, Juri
dc.okm.affiliatedauthorVeledina, Alexandra
dc.okm.affiliatedauthorTsygankov, Sergey
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeA1 ScientificArticle
dc.publisherEDP Sciences
dc.publisher.countryFranceen_GB
dc.publisher.countryRanskafi_FI
dc.publisher.country-codeFR
dc.relation.articlenumberA95
dc.relation.doi10.1051/0004-6361/202348277
dc.relation.ispartofjournalAstronomy and Astrophysics
dc.relation.volume684
dc.source.identifierhttps://www.utupub.fi/handle/10024/183589
dc.titleIXPE observation confirms a high spin in the accreting black hole 4U 1957+115
dc.year.issued2024

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