Analysis of Crab X-Ray Polarization Using Deeper Imaging X-Ray Polarimetry Explorer Observations

Wong, J.; Mizuno, T.; Bucciantini, N.; Romani, R.W.; Yang, Y.J.; Liu, K.; Deng, W.; Goya, K.; Xie, F.; Pilia, M.; Kaaret, P.; Weisskopf, M.C.; Silvestri, S.; Ng, C.Y.; Chen, C.T.; Agudo, I.; Antonelli, L.A.; Bachetti, M.; Baldini, L.; Baumgartner, W.H.; Bellazzini, R.; Bianchi, S.; Bongiorno, S.D.; Bonino, R.; Brez, A.; Capitanio, F.; Castellano, S.; Cavazzuti, E.; Ciprini, S.; Costa, E.; De Rosa, A.; Del Monte, E.; Di Gesu, L.; Di Lalla, N.; Di Marco, A.; Donnarumma, I.; Doroshenko, V.; Dovčiak, M.; Ehlert, S.R.; Enoto, T.; Evangelista, Y.; Fabiani, S.; Ferrazzoli, R.; Garcia, J.A.; Gunji, S.; Heyl, J.; Iwakiri, W.; Jorstad, S.G.; Karas, V.; Kislat, F.; Kitaguchi, T.; Kolodziejczak, J.J.; Krawczynski, H.; La Monaca, F.; Latronico, L.; Liodakis, I.; Maldera, S.; Manfreda, A.; Marin, F.; Marinucci, A.; Marscher, A.P.; Marshall, H.L.; Massaro, F.; Matt, G.; Mitsuishi, I.; Muleri, F.; Negro, M.; O’Dell, S.L.; Omodei, N.; Oppedisano, C.; Papitto, A.; Pavlov, G.G.; Peirson, A.L.; Perri, M.; Pesce-Rollins, M.; Petrucci, P.O.; Possenti, A.; Poutanen, J.; Puccetti, S.; Ramsey, B.D.; Rankin, J.; Ratheesh, A.; Roberts, O.J.; Sgró, C.; Slane, P.; Soffitta, P.; Spandre, G.; Swartz, D.A.; Tamagawa, T.; Tavecchio, F.; Taverna, R.; Tawara, Y.; Tennant, A.F.; Thomas, N.E.; Tombesi, F.; Trois, A.; Tsygankov, S.; Turolla, R.; Vink, J.; Wu, K.; Zane, S.
Analysis of Crab X-Ray Polarization Using Deeper Imaging X-Ray Polarimetry Explorer Observations

Wong, J.
Mizuno, T.
Bucciantini, N.
Romani, R.W.
Yang, Y.J.
Liu, K.
Deng, W.
Goya, K.
Xie, F.
Pilia, M.
Kaaret, P.
Weisskopf, M.C.
Silvestri, S.
Ng, C.Y.
Chen, C.T.
Agudo, I.
Antonelli, L.A.
Bachetti, M.
Baldini, L.
Baumgartner, W.H.
Bellazzini, R.
Bianchi, S.
Bongiorno, S.D.
Bonino, R.
Brez, A.
Capitanio, F.
Castellano, S.
Cavazzuti, E.
Ciprini, S.
Costa, E.
De Rosa, A.
Del Monte, E.
Di Gesu, L.
Di Lalla, N.
Di Marco, A.
Donnarumma, I.
Doroshenko, V.
Dovčiak, M.
Ehlert, S.R.
Enoto, T.
Evangelista, Y.
Fabiani, S.
Ferrazzoli, R.
Garcia, J.A.
Gunji, S.
Heyl, J.
Iwakiri, W.
Jorstad, S.G.
Karas, V.
Kislat, F.
Kitaguchi, T.
Kolodziejczak, J.J.
Krawczynski, H.
La Monaca, F.
Latronico, L.
Liodakis, I.
Maldera, S.
Manfreda, A.
Marin, F.
Marinucci, A.
Marscher, A.P.
Marshall, H.L.
Massaro, F.
Matt, G.
Mitsuishi, I.
Muleri, F.
Negro, M.
O’Dell, S.L.
Omodei, N.
Oppedisano, C.
Papitto, A.
Pavlov, G.G.
Peirson, A.L.
Perri, M.
Pesce-Rollins, M.
Petrucci, P.O.
Possenti, A.
Poutanen, J.
Puccetti, S.
Ramsey, B.D.
Rankin, J.
Ratheesh, A.
Roberts, O.J.
Sgró, C.
Slane, P.
Soffitta, P.
Spandre, G.
Swartz, D.A.
Tamagawa, T.
Tavecchio, F.
Taverna, R.
Tawara, Y.
Tennant, A.F.
Thomas, N.E.
Tombesi, F.
Trois, A.
Tsygankov, S.
Turolla, R.
Vink, J.
Wu, K.
Zane, S.
Katso/Avaa
Lataukset: 

Institute of Physics
doi:10.3847/1538-4357/ad6309
URI
https://doi.org/10.3847/1538-4357/ad6309
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Julkaisun pysyvä osoite on:
https://urn.fi/URN:NBN:fi-fe2025082791895
Tiivistelmä
We present Crab X-ray polarization measurements using Imaging X-Ray Polarimetry Explorer (IXPE) data with a total exposure of 300 ks, three times more than the initial 2022 discovery paper. Polarization is detected in three times more pulsar phase bins, revealing an S-shaped +40° polarization angle sweep in the main pulse and >1σ departures from the OPTIMA optical polarization in both pulses, suggesting different radiation mechanisms or sites for the polarized emission at the two wavebands. Our polarization map of the inner nebula reveals a toroidal magnetic field, as seen in prior IXPE analyses. Along the southern jet, the magnetic field orientation relative to the jet axis changes from perpendicular to parallel and the polarization degree decreases by ∼6%. These observations may be explained by kink instabilities along the jet or a collision with a dense, jet-deflecting medium at the tip. Using spectropolarimetric analysis, we find asymmetric polarization in the four quadrants of the inner nebula, as expected for a toroidal field geometry, and a spatial correlation between polarization degree and photon index.
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