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

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arxiv 2207.09338 v1 pith:ZVUN4BZP submitted 2022-07-19 astro-ph.HE

A. Marinucci , F. Muleri , M. Dovčiak , S. Bianchi , F. Marin , G. Matt , F. Ursini , R. Middei
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H. L. Marshall L. Baldini T. Barnouin N. Cavero Rodriguez A. De Rosa L. Di Gesu D. Harper A. Ingram V. Karas H. Krawczynski G. Madejski C. Panagiotou P. O. Petrucci J. Podgorny S. Puccetti 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 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 K. Hayashida J. Heyl W. Iwakiri S. G. Jorstad T. Kitaguchi J. J. Kolodziejczak F. La Monaca L. Latronico I. Liodakis S. Maldera A. Manfreda A. P. Marscher I. Mitsuishi T. Mizuno 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 J. Poutanen B. D. Ramsey J. Rankin A. Ratheesh R. W. Romani C. Sgrò P. Slane P. Soffitta G. Spandre 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 coronageometryixpemcg-05-23-16nustarpolarizationseyfertx-ray
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abstract

We report on the first observation of a radio-quiet Active Galactic Nucleus (AGN) using polarized X-rays: the Seyfert 1.9 galaxy MCG-05-23-16. This source was pointed 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 smaller than $\Pi<4.7\%$ (at the 99% c.l.) 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 $\Gamma=1.85\pm0.01$ and a high-energy cutoff $E_{\rm C}=120\pm15$ 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$^{\circ}$.

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Cited by 2 Pith papers

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