Research output: Contribution to journal › Article › peer-review
X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei: NGC 1068. / Marin, F.; Marinucci, A.; Laurenti, M.; Barnouin, T.; Di Marco, A.; Ursini, F.; Bianchi, S.; Ravi, S.; Marshall, H. L.; Matt, G.; Gianolli, V. E.; Ingram, A.; Middei, R.; Maksym, W. P.; Panagiotou, C.; Podgorny, J.; Puccetti, S.; Ratheesh, A.; Tombesi, F.; Agudo, I.; Antonelli, L. A.; Bachetti, M.; Baldini, L.; Baumgartner, W.; Bellazzini, R.; Bongiorno, S.; Bonino, R.; Brez, A.; Bucciantini, N.; Capitanio, F.; Castellano, S.; Cavazzuti, E.; Ciprini, S.; Costa, E.; De Rosa, A.; Del Monte, E.; Di Gesu, L.; Di Lalla, N.; Donnarumma, I.; Doroshenko, V.; Dovčiak, M.; Ehlert, S.; Enoto, T.; Evangelista, Y.; Fabiani, S.; Ferrazzoli, R.; Garcia, J.; Gunji, S.; Heyl, J.; Iwakiri, W.; Jorstad, S.; Kaaret, P.; Karas, V.; Kislat, F.; Kitaguchi, T.; Kolodziejczak, J.; Krawczynski, H.; La Monaca, F.; Latronico, L.; Liodakis, I.; Madejski, G.; Maldera, S.; Manfreda, A.; Marscher, A.; Massaro, F.; Mitsuishi, I.; Mizuno, T.; Muleri, F.; Negro, M.; Ng, S.; O'Dell, S.; Omodei, N.; Oppedisano, C.; Papitto, A.; Pavlov, G.; Perri, M.; Pesce-Rollins, M.; Petrucci, P. -O.; Pilia, M.; Possenti, A.; Poutanen, J.; Ramsey, B.; Rankin, J.; Roberts, O.; Romani, R.; Sgrò, C.; Slane, P.; Soffitta, P.; Spandre, G.; Swartz, D.; Tamagawa, T.; Tavecchio, F.; Taverna, R.; Tawara, Y.; Tennant, A.; Thomas, N.; Trois, A.; Tsygankov, S.; Turolla, R.; Vink, J.; Weisskopf, M.; Xie, F.; Zane, S.
In: Astronomy and Astrophysics, Vol. 689, A238, 01.09.2024.Research output: Contribution to journal › Article › peer-review
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TY - JOUR
T1 - X-ray polarization measurement of the gold standard of radio-quiet active galactic nuclei: NGC 1068
AU - Marin, F.
AU - Marinucci, A.
AU - Laurenti, M.
AU - Barnouin, T.
AU - Di Marco, A.
AU - Ursini, F.
AU - Bianchi, S.
AU - Ravi, S.
AU - Marshall, H. L.
AU - Matt, G.
AU - Gianolli, V. E.
AU - Ingram, A.
AU - Middei, R.
AU - Maksym, W. P.
AU - Panagiotou, C.
AU - Podgorny, J.
AU - Puccetti, S.
AU - Ratheesh, A.
AU - Tombesi, F.
AU - Agudo, I.
AU - Antonelli, L. A.
AU - Bachetti, M.
AU - Baldini, L.
AU - Baumgartner, W.
AU - Bellazzini, R.
AU - Bongiorno, S.
AU - Bonino, R.
AU - Brez, A.
AU - Bucciantini, N.
AU - Capitanio, F.
AU - Castellano, S.
AU - Cavazzuti, E.
AU - Ciprini, S.
AU - Costa, E.
AU - De Rosa, A.
AU - Del Monte, E.
AU - Di Gesu, L.
AU - Di Lalla, N.
AU - Donnarumma, I.
AU - Doroshenko, V.
AU - Dovčiak, M.
AU - Ehlert, S.
AU - Enoto, T.
AU - Evangelista, Y.
AU - Fabiani, S.
AU - Ferrazzoli, R.
AU - Garcia, J.
AU - Gunji, S.
AU - Heyl, J.
AU - Iwakiri, W.
AU - Jorstad, S.
AU - Kaaret, P.
AU - Karas, V.
AU - Kislat, F.
AU - Kitaguchi, T.
AU - Kolodziejczak, J.
AU - Krawczynski, H.
AU - La Monaca, F.
AU - Latronico, L.
AU - Liodakis, I.
AU - Madejski, G.
AU - Maldera, S.
AU - Manfreda, A.
AU - Marscher, A.
AU - Massaro, F.
AU - Mitsuishi, I.
AU - Mizuno, T.
AU - Muleri, F.
AU - Negro, M.
AU - Ng, S.
AU - O'Dell, S.
AU - Omodei, N.
AU - Oppedisano, C.
AU - Papitto, A.
AU - Pavlov, G.
AU - Perri, M.
AU - Pesce-Rollins, M.
AU - Petrucci, P. -O.
AU - Pilia, M.
AU - Possenti, A.
AU - Poutanen, J.
AU - Ramsey, B.
AU - Rankin, J.
AU - Roberts, O.
AU - Romani, R.
AU - Sgrò, C.
AU - Slane, P.
AU - Soffitta, P.
AU - Spandre, G.
AU - Swartz, D.
AU - Tamagawa, T.
AU - Tavecchio, F.
AU - Taverna, R.
AU - Tawara, Y.
AU - Tennant, A.
AU - Thomas, N.
AU - Trois, A.
AU - Tsygankov, S.
AU - Turolla, R.
AU - Vink, J.
AU - Weisskopf, M.
AU - Xie, F.
AU - Zane, S.
PY - 2024/9/1
Y1 - 2024/9/1
N2 - Context. NGC 1068 is the most observed radio-quiet active galactic nucleus (AGN) in polarimetry, yet its high-energy polarization has never been probed before due to a lack of dedicated polarimeters. Aims. Using the first X-ray polarimeter sensitive enough to measure the polarization of AGNs, we want to probe the orientation and geometric arrangement of (sub)parsec-scale matter around the X-ray source. Methods. We used the Imaging X-ray Polarimetry Explorer (IXPE) satellite to measure, for the first time, the 2–8 keV polarization of NGC 1068. We pointed IXPE at the target for a net exposure time of 1.15 Ms, in addition to using two Chandra snapshots of ∼10 ks each in order to account for the potential impact of several ultraluminous X-ray sources (ULXs) within IXPE's field of view. Results. We measured a 2–8 keV polarization degree of 12.4% ± 3.6% and an electric vector polarization angle of 101° ± 8° at a 68% confidence level. If we exclude the spectral region containing bright Fe K lines and other soft X-ray lines where depolarization occurs, the polarization fraction rises to 21.3% ± 6.7% in the 3.5–6.0 keV band, with a similar polarization angle. The observed polarization angle is found to be perpendicular to the parsec-scale radio jet. Using a combined Chandra and IXPE analysis plus multiwavelength constraints, we estimated that the circumnuclear "torus" may sustain a half-opening angle of 50–55° (from the vertical axis of the system). Conclusions. Thanks to IXPE, we have measured the X-ray polarization of NGC 1068 and found comparable results, both in terms of the polarization angle orientation with respect to the radio jet and the torus half-opening angle, to the X-ray polarimetric measurement achieved for the other archetypal Compton-thick AGN: the Circinus galaxy. Probing the geometric arrangement of parsec-scale matter in extragalactic objects is now feasible thanks to X-ray polarimetry.
AB - Context. NGC 1068 is the most observed radio-quiet active galactic nucleus (AGN) in polarimetry, yet its high-energy polarization has never been probed before due to a lack of dedicated polarimeters. Aims. Using the first X-ray polarimeter sensitive enough to measure the polarization of AGNs, we want to probe the orientation and geometric arrangement of (sub)parsec-scale matter around the X-ray source. Methods. We used the Imaging X-ray Polarimetry Explorer (IXPE) satellite to measure, for the first time, the 2–8 keV polarization of NGC 1068. We pointed IXPE at the target for a net exposure time of 1.15 Ms, in addition to using two Chandra snapshots of ∼10 ks each in order to account for the potential impact of several ultraluminous X-ray sources (ULXs) within IXPE's field of view. Results. We measured a 2–8 keV polarization degree of 12.4% ± 3.6% and an electric vector polarization angle of 101° ± 8° at a 68% confidence level. If we exclude the spectral region containing bright Fe K lines and other soft X-ray lines where depolarization occurs, the polarization fraction rises to 21.3% ± 6.7% in the 3.5–6.0 keV band, with a similar polarization angle. The observed polarization angle is found to be perpendicular to the parsec-scale radio jet. Using a combined Chandra and IXPE analysis plus multiwavelength constraints, we estimated that the circumnuclear "torus" may sustain a half-opening angle of 50–55° (from the vertical axis of the system). Conclusions. Thanks to IXPE, we have measured the X-ray polarization of NGC 1068 and found comparable results, both in terms of the polarization angle orientation with respect to the radio jet and the torus half-opening angle, to the X-ray polarimetric measurement achieved for the other archetypal Compton-thick AGN: the Circinus galaxy. Probing the geometric arrangement of parsec-scale matter in extragalactic objects is now feasible thanks to X-ray polarimetry.
KW - polarization
KW - galaxies: active
KW - galaxies: Seyfert
KW - X-rays: galaxies
KW - X-rays: individuals: NGC 1068
KW - Astrophysics - High Energy Astrophysical Phenomena
KW - Astrophysics - Astrophysics of Galaxies
KW - 85-06
KW - J.2.3
KW - J.2.9
UR - https://www.mendeley.com/catalogue/a9c7945d-0bc7-37e9-9bda-f3389d24b062/
U2 - 10.1051/0004-6361/202449760
DO - 10.1051/0004-6361/202449760
M3 - Article
VL - 689
JO - ASTRONOMY & ASTROPHYSICS
JF - ASTRONOMY & ASTROPHYSICS
SN - 0004-6361
M1 - A238
ER -
ID: 125281976