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

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 May 14, 2022 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
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Contributor : Olivier Hauss Connect in order to contact the contributor
Submitted on : Monday, October 3, 2022 - 3:43:30 PM
Last modification on : Thursday, November 24, 2022 - 5:02:58 PM

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A. Marinucci, F. Muleri, M. Dovciak, S. Bianchi, F. Marin, et al.. Polarization constraints on the X-ray corona in Seyfert Galaxies: MCG-05-23-16. Monthly Notices of the Royal Astronomical Society, 2022, 516 (4), pp.5907-5913. ⟨10.1093/mnras/stac2634⟩. ⟨insu-03794870⟩



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