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

Journal
Date Issued
2022
Author(s)
Marinucci, A.
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Dovciak, M.
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BIANCHI, Simone
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Marin, F.
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Matt, G.
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Middei, R.
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Marshall, H. L.
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Baldini, L.
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Barnouin, T.
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Rodriguez, N. Cavero
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Di Gesu, L.
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Harper, D.
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Ingram, A.
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Karas, V.
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Krawczynski, H.
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Madejski, G.
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Panagiotou, C.
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Petrucci, P. O.
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Podgorny, J.
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Puccetti, S.
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Veledina, A.
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Zhang, W.
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Agudo, I.
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Baumgartner, W. H.
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Bellazzini, R.
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Bongiorno, S. D.
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Bonino, R.
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Brez, A.
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Castellano, S.
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Cavazzuti, E.
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Ciprini, S.
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Di Lalla, N.
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Donnarumma, I.
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Doroshenko, V.
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Ehlert, S. R.
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Enoto, T.
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Ferrazzoli, R.
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Garcia, J. A.
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Gunji, S.
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Hayashida, K.
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Heyl, J.
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Iwakiri, W.
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Jorstad, S. G.
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Kitaguchi, T.
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Kolodziejczak, J. J.
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Latronico, L.
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Liodakis, I.
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Maldera, S.
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Manfreda, A.
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Marscher, A. P.
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Mitsuishi, I.
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Mizuno, T.
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Ng, C. -Y.
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O'Dell, S. L.
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Omodei, N.
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Oppedisano, C.
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Pavlov, G. G.
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Peirson, A. L.
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Pesce-Rollins, M.
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Poutanen, J.
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Ramsey, B. D.
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Rankin, J.
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Ratheesh, A.
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Romani, R. W.
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Sgrš, C.
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Slane, P.
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Spandre, G.
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Tamagawa, T.
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Taverna, R.
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Tawara, Y.
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Tennant, A. F.
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Thomas, N. E.
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Tsygankov, S. S.
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Turolla, R.
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Vink, J.
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Weisskopf, M. C.
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Wu, K.
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Zane, S.
DOI
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°....
Volume
516
Issue
4
Start page
5907
Uri
Url
Issn Identifier
0035-8711
Rights
open.access
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