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Lookup NU author(s): Dr Adam IngramORCiD, Melissa Ewing, Dr David RosarioORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023 The Author(s). We present an X-ray spectro-polarimetric analysis of the bright Seyfert galaxy IC 4329A. The Imaging X-ray Polarimetry Explorer (IXPE) observed the source for ∼500 ks, supported by XMM-Newton (∼60 ks) and NuSTAR (∼80 ks) exposures. We detect polarization in the 2-8 keV band with 2.97σ confidence. We report a polarization degree of 3.3 ± 1.1 per cent and a polarization angle of 78° ± 10° (errors are 1σ confidence). The X-ray polarization is consistent with being aligned with the radio jet, albeit partially due to large uncertainties on the radio position angle. We jointly fit the spectra from the three observatories to constrain the presence of a relativistic reflection component. From this, we obtain constraints on the inclination angle to the inner disc (<39° at 99 per cent confidence) and the disc inner radius (<11 gravitational radii at 99 per cent confidence), although we note that modelling systematics in practice add to the quoted statistical error. Our spectropolarimetric modelling indicates that the 2-8 keV polarization is consistent with being dominated by emission directly observed from the X-ray corona, but the polarization of the reflection component is completely unconstrained. Our constraints on viewer inclination and polarization degree tentatively favour more asymmetric, possibly out-flowing, coronal geometries that produce more highly polarized emission, but the coronal geometry is unconstrained at the 3σ level.
Author(s): Ingram A, Ewing M, Marinucci A, Tagliacozzo D, Rosario DJ, Veledina A, Kim DE, Marin F, Bianchi S, Poutanen J, Matt G, Marshall HL, Ursini F, De Rosa A, Petrucci P-O, Madejski G, Barnouin T, Di Gesu L, Dovciak M, Gianolli VE, Krawczynski H, Loktev V, Middei R, Podgorny J, Puccetti S, Ratheesh A, Soffitta P, Tombesi F, Ehlert SR, Massaro F, Agudo I, Antonelli LA, Bachetti M, Baldini L, Baumgartner WH, Bellazzini R, Bongiorno SD, Bonino R, Brez A, Bucciantini N, Capitanio F, Castellano S, Cavazzuti E, Chen C-T, Ciprini S, Costa E, Del Monte E, Di Lalla N, Di Marco A, Donnarumma I, Doroshenko V, Enoto T, Evangelista Y, Fabiani S, Ferrazzoli R, Garcia JA, Gunji S, Heyl J, Iwakiri W, Jorstad SG, Kaaret P, Karas V, Kislat F, Kitaguchi T, Kolodziejczak JJ, Monaca FL, Latronico L, Liodakis I, Maldera S, Manfreda A, Marscher AP, Mitsuishi I, Mizuno T, Muleri F, Negro M, Ng C-Y, O'dell SL, Omodei N, Oppedisano C, Papitto A, Pavlov GG, Peirson AL, Perri M, Pesce-Rollins M, Pilia M, Possenti A, Ramsey BD, Rankin J, Roberts OJ, Romani RW, Sgro C, Slane P, Spandre G, Swartz DA, Tamagawa T, Tavecchio F, Taverna R, Tawara Y, Tennant AF, Thomas NE, Trois A, Tsygankov SS, Turolla R, Vink J, Weisskopf MC, Wu K, Xie F, Zane S
Publication type: Article
Publication status: Published
Journal: Monthly Notices of the Royal Astronomical Society
Year: 2023
Volume: 525
Issue: 4
Pages: 5437-5449
Print publication date: 01/11/2023
Online publication date: 01/09/2023
Acceptance date: 29/08/2023
Date deposited: 06/12/2024
ISSN (print): 0035-8711
ISSN (electronic): 1365-2966
Publisher: Oxford University Press
URL: https://doi.org/10.1093/mnras/stad2625
DOI: 10.1093/mnras/stad2625
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