A1 Refereed original research article in a scientific journal
X-Ray Polarization of the Eastern Lobe of SS 433
Authors: Kaaret, P.; Ferrazzoli, R.; Silvestri, S.; Negro, M.; Manfreda, A.; Wu, K.; Costa, E.; Soffitta, P.; Safi-Harb, S.; Poutanen, J.; Veledina, A.; Marco, A. D.; Slane, P.; Bianchi, S.; Ingram, A.; Romani, R. W.; Cibrario, N.; Intyre, B. M.; Mikus̆incová, R.; Ratheesh, A.; Steiner, J. F.; Svoboda, J.; Tugliani, S.; Agudo, I.; Antonelli, L. A.; Bachetti, M.; Baldini, L.; Baumgartner, W. H.; Bellazzini, R.; Bongiorno, S. D.; Bonino, R.; Brez, A.; Bucciantini, N.; Capitanio, F.; Castellano, S.; Cavazzuti, E.; Chen, C.; Ciprini, S.; Rosa, A. D.; Monte, E. D.; Gesu, L. D.; Lalla, N. D.; Donnarumma, I.; Doroshenko, V.; Dovčiak, M.; Ehlert, S. R.; Enoto, T.; Evangelista, Y.; Fabiani, S.; García, J. A.; Gunji, S.; Hayashida, K.; Heyl, J.; Iwakiri, W.; Jorstad, S. G.; Karas, V.; Kislat, F.; Kitaguchi, T.; Kolodziejczak, J. J.; Krawczynski, H.; Monaca, F. L.; Latronico, L.; Liodakis, I.; Maldera, S.; Marin, F.; Marinucci, A.; Marscher, A. P.; Marshall, H. L.; Massaro, F.; Matt, G.; Mitsuishi, I.; Mizuno, T.; Muleri, F.; Ng, C.; O’Dell, S. L.; Omodei, N.; Oppedisano, C.; Papitto, A.; Pavlov, G. G.; Peirson, A. L.; Perri, M.; Pesce-Rollins, M.; Petrucci, P.; Pilia, M.; Possenti, A.; Puccetti, S.; Ramsey, B. D.; Rankin, J.; Roberts, O. J.; Sgrò, C.; 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. S.; Turolla, R.; Vink, J.; Weisskopf, M. C.; Xie, F.; Zane, S.
Publisher: Institute of Physics Publishing
Publication year: 2024
Journal: Astrophysical Journal Letters
Journal name in source: The Astrophysical Journal Letters
Article number: L12
Volume: 961
Issue: 1
eISSN: 2041-8213
DOI: https://doi.org/10.3847/2041-8213/ad103b
Publication's open availability at the time of reporting: Open Access
Publication channel's open availability : Open Access publication channel
Web address : https://dx.doi.org/10.3847/2041-8213/ad103b
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/381279088
Self-archived copy's licence: CC BY
Self-archived copy's version: Publisher`s PDF
How astrophysical systems translate the kinetic energy of bulk motion into the acceleration of particles to very high energies is a pressing question. SS 433 is a microquasar that emits TeV γ-rays indicating the presence of high-energy particles. A region of hard X-ray emission in the eastern lobe of SS 433 was recently identified as an acceleration site. We observed this region with the Imaging X-ray Polarimetry Explorer and measured a polarization degree in the range 38%–77%. The high polarization degree indicates the magnetic field has a well-ordered component if the X-rays are due to synchrotron emission. The polarization angle is in the range −12° to +10° (east of north), which indicates that the magnetic field is parallel to the jet. Magnetic fields parallel to the bulk flow have also been found in supernova remnants and the jets of powerful radio galaxies. This may be caused by interaction of the flow with the ambient medium.
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