학술논문
Polarization constraints on the X-ray corona in Seyfert Galaxies: MCG-05-23-16
Document Type
Working Paper
Author
Marinucci, A.; Muleri, F.; Dovčiak, M.; Bianchi, S.; Marin, F.; Matt, G.; Ursini, F.; Middei, R.; Marshall, H. L.; Baldini, L.; Barnouin, T.; Rodriguez, N. Cavero; De Rosa, A.; Di Gesu, L.; Harper, D.; Ingram, A.; Karas, V.; Krawczynski, H.; Madejski, G.; Panagiotou, C.; Petrucci, P. O.; Podgorny, J.; Puccetti, S.; Tombesi, F.; Veledina, A.; Zhang, W.; Agudo, I.; Antonelli, L. A.; Bachetti, M.; Baumgartner, W. H.; Bellazzini, R.; Bongiorno, S. D.; Bonino, R.; Brez, A.; Bucciantini, N.; Capitanio, F.; Castellano, S.; Cavazzuti, E.; Ciprini, S.; Costa, E.; Del Monte, E.; Di Lalla, N.; Di Marco, A.; Donnarumma, I.; Doroshenko, V.; Ehlert, S. R.; Enoto, T.; Evangelista, Y.; Fabiani, S.; Ferrazzoli, R.; Garcia, J. A.; Gunji, S.; Hayashida, K.; Heyl, J.; Iwakiri, W.; Jorstad, S. G.; Kitaguchi, T.; Kolodziejczak, J. J.; La Monaca, F.; Latronico, L.; Liodakis, I.; Maldera, S.; Manfreda, A.; Marscher, A. P.; Mitsuishi, I.; Mizuno, T.; Ng, C. -Y.; O'Dell, S. L.; Omodei, N.; Oppedisano, C.; Papitto, A.; Pavlov, G. G.; Peirson, A. L.; Perri, M.; Pesce-Rollins, M.; Pilia, M.; Possenti, A.; Poutanen, J.; Ramsey, B. D.; Rankin, J.; Ratheesh, A.; Romani, R. W.; Sgrò, C.; Slane, P.; Soffitta, P.; Spandre, G.; Tamagawa, T.; Tavecchio, F.; Taverna, R.; Tawara, Y.; Tennant, A. F.; Thomas, N. E.; Trois, A.; Tsygankov, S. S.; Turolla, R.; Vink, J.; Weisskopf, M. C.; Wu, K.; Xie, F.; Zane, S.
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Subject
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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$^{\circ}$.
Comment: 7 pages, 3 figures, 1 table. Submitted to MNRAS Letters
Comment: 7 pages, 3 figures, 1 table. Submitted to MNRAS Letters