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Limits on X-Ray Polarization at the Core of Centaurus A as Observed with the Imaging X-Ray Polarimetry Explorer

Ramsey BD; Tombesi F; Wu K; Ferrazzoli R; Bachetti M; Trois A; Bianchi S; Sgro C; Marinucci A; Karas V; Bellazzini R; Gunji S; Spandre G; Rankin J; Papitto A; Manfreda A; Castellano S; Kitaguchi T; Mizuno T; Iwakiri W; Ng CY; De Rosa A; Madejski G; Marshall HL; Ehlert SR; Tavecchio F; La Monaca F; Weisskopf MC; Tsygankov S; Pacciani L; Taverna R; Garcia JA; Brez A; Krawczynski H; Bonino R; Marscher AP; Thomas NE; Zane S; Jourdain E; Bongiorno SD; Dovciak M; Enoto T; Antonelli LA; Ratheesh A; Hayashida K; Turolla R; Tawara Y; Omodei N; Romani RW; Doroshenko V; Tamagawa T; Di Lalla N; Rodi J; Pavlov GG; Capitanio F; Bucciantini N; Jorstad SG; Middei R; Negro M; Di Gesu L; Latronico L; Slane P; Heyl J; Marin F; Cavazzuti E; Evangelista Y; Ciprini S; Massaro F; Pesce-Rollins M; Donnarumma I; Roques JP; Tennant AF; Baumgartner WH; Baldini L; Fabiani S; Liodakis I; Pilia M; Possenti A; Perri M; Matt G; Barnouin T; Peirson AL; Muleri F; Puccetti S; O'Dell SL; Maldera S; Xie F; Vink J; Soffitta P; Agudo I; Del Monte E; Costa E; Di Marco A; Poutanen J; Mitsuishi I; Kolodziejczak JJ; Oppedisano C; Petrucci PO

dc.contributor.authorRamsey BD
dc.contributor.authorTombesi F
dc.contributor.authorWu K
dc.contributor.authorFerrazzoli R
dc.contributor.authorBachetti M
dc.contributor.authorTrois A
dc.contributor.authorBianchi S
dc.contributor.authorSgro C
dc.contributor.authorMarinucci A
dc.contributor.authorKaras V
dc.contributor.authorBellazzini R
dc.contributor.authorGunji S
dc.contributor.authorSpandre G
dc.contributor.authorRankin J
dc.contributor.authorPapitto A
dc.contributor.authorManfreda A
dc.contributor.authorCastellano S
dc.contributor.authorKitaguchi T
dc.contributor.authorMizuno T
dc.contributor.authorIwakiri W
dc.contributor.authorNg CY
dc.contributor.authorDe Rosa A
dc.contributor.authorMadejski G
dc.contributor.authorMarshall HL
dc.contributor.authorEhlert SR
dc.contributor.authorTavecchio F
dc.contributor.authorLa Monaca F
dc.contributor.authorWeisskopf MC
dc.contributor.authorTsygankov S
dc.contributor.authorPacciani L
dc.contributor.authorTaverna R
dc.contributor.authorGarcia JA
dc.contributor.authorBrez A
dc.contributor.authorKrawczynski H
dc.contributor.authorBonino R
dc.contributor.authorMarscher AP
dc.contributor.authorThomas NE
dc.contributor.authorZane S
dc.contributor.authorJourdain E
dc.contributor.authorBongiorno SD
dc.contributor.authorDovciak M
dc.contributor.authorEnoto T
dc.contributor.authorAntonelli LA
dc.contributor.authorRatheesh A
dc.contributor.authorHayashida K
dc.contributor.authorTurolla R
dc.contributor.authorTawara Y
dc.contributor.authorOmodei N
dc.contributor.authorRomani RW
dc.contributor.authorDoroshenko V
dc.contributor.authorTamagawa T
dc.contributor.authorDi Lalla N
dc.contributor.authorRodi J
dc.contributor.authorPavlov GG
dc.contributor.authorCapitanio F
dc.contributor.authorBucciantini N
dc.contributor.authorJorstad SG
dc.contributor.authorMiddei R
dc.contributor.authorNegro M
dc.contributor.authorDi Gesu L
dc.contributor.authorLatronico L
dc.contributor.authorSlane P
dc.contributor.authorHeyl J
dc.contributor.authorMarin F
dc.contributor.authorCavazzuti E
dc.contributor.authorEvangelista Y
dc.contributor.authorCiprini S
dc.contributor.authorMassaro F
dc.contributor.authorPesce-Rollins M
dc.contributor.authorDonnarumma I
dc.contributor.authorRoques JP
dc.contributor.authorTennant AF
dc.contributor.authorBaumgartner WH
dc.contributor.authorBaldini L
dc.contributor.authorFabiani S
dc.contributor.authorLiodakis I
dc.contributor.authorPilia M
dc.contributor.authorPossenti A
dc.contributor.authorPerri M
dc.contributor.authorMatt G
dc.contributor.authorBarnouin T
dc.contributor.authorPeirson AL
dc.contributor.authorMuleri F
dc.contributor.authorPuccetti S
dc.contributor.authorO'Dell SL
dc.contributor.authorMaldera S
dc.contributor.authorXie F
dc.contributor.authorVink J
dc.contributor.authorSoffitta P
dc.contributor.authorAgudo I
dc.contributor.authorDel Monte E
dc.contributor.authorCosta E
dc.contributor.authorDi Marco A
dc.contributor.authorPoutanen J
dc.contributor.authorMitsuishi I
dc.contributor.authorKolodziejczak JJ
dc.contributor.authorOppedisano C
dc.contributor.authorPetrucci PO
dc.date.accessioned2022-10-28T13:28:33Z
dc.date.available2022-10-28T13:28:33Z
dc.identifier.urihttps://www.utupub.fi/handle/10024/165436
dc.description.abstractWe present measurements of the polarization of X-rays in the 2-8 keV band from the nucleus of the radio galaxy Centaurus A (Cen A), using a 100 ks observation from the Imaging X-ray Polarimetry Explorer (IXPE). Nearly simultaneous observations of Cen A were also taken with the Swift, NuSTAR, and INTEGRAL observatories. No statistically significant degree of polarization is detected with IXPE. These observations have a minimum detectable polarization at 99% confidence (MDP99) of 6.5% using a weighted, spectral model-independent calculation in the 2-8 keV band. The polarization angle psi is consequently unconstrained. Spectral fitting across three orders of magnitude in X-ray energy (0.3-400 keV) demonstrates that the SED of Cen A is well described by a simple power law with moderate intrinsic absorption (N (H) similar to 10(23) cm(-2)) and a Fe K alpha emission line, although a second unabsorbed power law is required to account for the observed spectrum at energies below 2 keV. This spectrum suggests that the reprocessing material responsible for this emission line is optically thin and distant from the central black hole. Our upper limits on the X-ray polarization are consistent with the predictions of Compton scattering, although the specific seed photon population responsible for the production of the X-rays cannot be identified. The low polarization degree, variability in the core emission, and the relative lack of variability in the Fe K alpha emission line support a picture where electrons are accelerated in a region of highly disordered magnetic fields surrounding the innermost jet.
dc.language.isoen
dc.publisherIOP Publishing Ltd
dc.titleLimits on X-Ray Polarization at the Core of Centaurus A as Observed with the Imaging X-Ray Polarimetry Explorer
dc.identifier.urlhttps://iopscience.iop.org/article/10.3847/1538-4357/ac8056
dc.identifier.urnURN:NBN:fi-fe2022102463059
dc.relation.volume935
dc.contributor.organizationfi=Suomen ESO-keskus, yhteiset|en=Finnish Centre for Astronomy with ESO - FINCA|
dc.contributor.organizationfi=Tuorlan observatorio|en=Tuorla Observatory|
dc.contributor.organization-code2606705
dc.contributor.organization-code2609700
dc.converis.publication-id176536414
dc.converis.urlhttps://research.utu.fi/converis/portal/Publication/176536414
dc.identifier.eissn1538-4357
dc.identifier.jour-issn0004-637X
dc.okm.affiliatedauthorLiodakis, Yannis
dc.okm.affiliatedauthorTsygankov, Sergey
dc.okm.affiliatedauthorPoutanen, Juri
dc.okm.discipline115 Avaruustieteet ja tähtitiedefi_FI
dc.okm.discipline115 Astronomy and space scienceen_GB
dc.okm.internationalcopublicationinternational co-publication
dc.okm.internationalityInternational publication
dc.okm.typeJournal article
dc.publisher.countryUnited Kingdomen_GB
dc.publisher.countryBritanniafi_FI
dc.publisher.country-codeGB
dc.relation.articlenumber116
dc.relation.doi10.3847/1538-4357/ac8056
dc.relation.ispartofjournalAstrophysical Journal
dc.relation.issue2
dc.year.issued2022


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