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The X-ray polarization of the Seyfert 1 galaxy IC 4329A
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SYSNO ASEP 0580071 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title The X-ray polarization of the Seyfert 1 galaxy IC 4329A Author(s) Ingram, A. (GB)
Ewing, S. R. (GB)
Marinucci, A. (IT)
Dovčiak, Michal (ASU-R) RID, ORCID
Podgorný, Jakub (ASU-R)
Karas, Vladimír (ASU-R) RID, ORCIDNumber of authors 108 Source Title Monthly Notices of the Royal Astronomical Society. - : Oxford University Press - ISSN 0035-8711
Roč. 525, č. 4 (2023), s. 5437-5449Number of pages 13 s. Publication form Online - E Language eng - English Country US - United States Keywords polarization ; active galaxies ; IC 4329A OECD category Astronomy (including astrophysics,space science) Method of publishing Open access Institutional support ASU-R - RVO:67985815 UT WOS 001085055000008 EID SCOPUS 85173271012 DOI 10.1093/mnras/stad2625 Annotation 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. Workplace Astronomical Institute Contact Radka Svašková, bibl@asu.cas.cz, Tel.: 323 620 326 Year of Publishing 2024 Electronic address https://hdl.handle.net/11104/0348853
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