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

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arxiv 2305.10213 v1 pith:MHH5B2CW submitted 2023-05-17 astro-ph.HE

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

D. Tagliacozzo , A. Marinucci , F. Ursini , G. Matt , S. Bianchi , L. Baldini , T. Barnouin , N. Cavero Rodriguez
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A. De Rosa L. Di Gesu M. Dovciak D. Harper A. Ingram V. Karas D. E. Kim H. Krawczynski G. Madejski F. Marin R. Middei H. L. Marshall F. Muleri C. Panagiotou P. O. Petrucci J. Podgorny J. Poutanen S. Puccetti P. Soffitta F. Tombesi A. Veledina W. Zhang I. Agudo L. A. Antonelli M. Bachetti W. H. Baumgartner R. Bellazzini S. D. Bongiorno R. Bonino A. Brez N. Bucciantini F. Capitanio S. Castellano E. Cavazzuti C. T. Chen S. Ciprini E. Costa E. Del Monte N. Di Lalla A. Di Marco I. Donnarumma V. Doroshenko S. R. Ehlert T. Enoto Y. Evangelista S. Fabiani R. Ferrazzoli J. A. Garcia S. Gunji J. Heyl W. Iwakiri S. G. Jorstad P. Kaaret F. Kislat T. Kitaguchi J. J. Kolodziejczak F. La Monaca L. Latronico I. Liodakis S. Maldera A. Manfreda A. P. Marscher F. Massaro I. Mitsuishi T. Mizuno M. Negro C. Y. Ng S. L. O'Dell N. Omodei C. Oppedisano A. Papitto G. G. Pavlov A. L. Peirson M. Perri M. Pesce Rollins M. Pilia A. Possenti B. D. Ramsey J. Rankin A. Ratheesh O. J. Roberts R. W. Romani C. Sgr\`o P. Slane G. Spandre D. A. Swartz T. Tamagawa F. Tavecchio R. Taverna Y. Tawara A. F. Tennant N. E. Thomas A. Trois S. S. Tsygankov R. Turolla J. Vink M. C. Weisskopf K. Wu F. Xie S. Zane
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keywords centconfidencecoronageometryinclinationixpelevelmcg-05-23-16
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We report on the second observation of the radio-quiet active galactic nucleus (AGN) 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 May 2022 (simultaneous with XMM-Newton and NuSTAR) we find a 2-8 keV polarization degree $\Pi$ = 1.6 $\pm$ 0.7 (at 68 per cent confidence level), which corresponds to an upper limit $\Pi$ = 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 fit inclination value from a spectroscopic analysis is considered, a cone-shaped corona along the disc axis is disfavoured.

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