Data di Pubblicazione:
2022
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 pi 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 Gamma = 1.85 +/- 0.01 and a high-energy cutoff E-C = 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 degrees.
Tipologia CRIS:
03A-Articolo su Rivista
Keywords:
galaxies: active; galaxies: individual: MCG-05-23-16-polarization; galaxies: Seyfert
Elenco autori:
Marinucci A.; Muleri F.; Dovciak M.; Bianchi S.; Marin F.; Matt G.; Ursini F.; Middei R.; Marshall H.L.; Baldini L.; Barnouin T.; Rodriguez N.C.; 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.; Sgrš 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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