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The geometry of the hot corona in MCG-05-23-16 constrained by X-ray polarimetry

Tagliacozzo, D; Marinucci, A; Ursini, F; Matt, G; Bianchi, S; Baldini, L; Barnouin, T; ... Zane, S; + view all (2023) The geometry of the hot corona in MCG-05-23-16 constrained by X-ray polarimetry. Monthly Notices of the Royal Astronomical Society , 525 (3) pp. 4735-4743. 10.1093/mnras/stad2627. Green open access

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Abstract

We report on the second observation of the radio-quiet active galactic nucleus MCG-05-23-16 performed with the Imaging X-ray Polarimetry Explorer (IXPE). The observation started on 2022 November 6 for a net observing time of 640 ks, and was partly simultaneous with NuSTAR (86 ks). After combining these data with those obtained in the first IXPE pointing on 2022 May (simultaneous with XMM–Newton and NuSTAR) we find a 2–8 keV polarization degree Π = 1.6 ± 0.7 (at 68 per cent confidence level), which corresponds to an upper limit Π = 3.2 per cent (at 99 per cent confidence level). We then compare the polarization results with Monte Carlo simulations obtained with the monk code, with which different coronal geometries have been explored (spherical lamppost, conical, slab, and wedge). Furthermore, the allowed range of inclination angles is found for each geometry. If the best-fitting inclination value from a spectroscopic analysis is considered, a cone-shaped corona along the disc axis is disfavoured.

Type: Article
Title: The geometry of the hot corona in MCG-05-23-16 constrained by X-ray polarimetry
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stad2627
Publisher version: https://doi.org/10.1093/mnras/stad2627
Language: English
Additional information: This version is the version of record. For information on re-use, please refer to the publisher’s terms and conditions.
Keywords: Polarization, galaxies: active, galaxies: Seyfert, X-rays: galaxies, X-rays: individual: MCG-05-23-16
UCL classification: UCL
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Space and Climate Physics
URI: https://discovery.ucl.ac.uk/id/eprint/10177943
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