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Polarization constraints on the X-ray corona in Seyfert Galaxies: MCG-05-23-16

Marinucci, A; Muleri, F; Dovanjak, M; Bianchi, S; Marin, F; Wu, K; Turolla, R; (2022) Polarization constraints on the X-ray corona in Seyfert Galaxies: MCG-05-23-16. Monthly Notices of the Royal Astronomical Society , 516 (4) pp. 5907-5913. 10.1093/mnras/stac2634. Green open access

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Abstract

We report on the first observation of a radio-quiet active galactic nucleus (AGN) in polarized X-rays: the Seyfert 1.9 galaxy MCG-05-23-16. This source was pointed at with the Imaging X-ray Polarimetry Explorer (IXPE) starting on 2022 May 14 for a net observing time of 486 ks, simultaneously with XMM-Newton (58 ks) and NuSTAR (83 ks). A polarization degree Π smaller than 4.7 per cent (at the 99 per cent confidence level) is derived in the 2–8 keV energy range, where emission is dominated by the primary component ascribed to the hot corona. The broad-band spectrum, inferred from a simultaneous fit to the IXPE, NuSTAR, and XMM-Newton data, is well reproduced by a power law with photon index Γ = 1.85 ± 0.01 and a high-energy cutoff EC = 120 ± 15 keV. A comparison with Monte Carlo simulations shows that a lamp-post and a conical geometry of the corona are consistent with the observed upper limit, a slab geometry is allowed only if the inclination angle of the system is less than 50°.

Type: Article
Title: Polarization constraints on the X-ray corona in Seyfert Galaxies: MCG-05-23-16
Open access status: An open access version is available from UCL Discovery
DOI: 10.1093/mnras/stac2634
Publisher version: https://doi.org/10.1093/mnras/stac2634
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: Galaxies: active, galaxies: individual: MCG-05-23-16 - polarization, galaxies: Seyfert
UCL classification: 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
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL
URI: https://discovery-pp.ucl.ac.uk/id/eprint/10155719
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