X-Ray Polarization of the Eastern Lobe of SS 433

0583317 - ASÚ 2025 RIV US eng J - Journal Article
Kaaret, P. - Ferrazzoli, R. - Silvestri, S. - Svoboda, Jiří - Dovčiak, Michal - Karas, Vladimír … Total 106 authors
X-Ray Polarization of the Eastern Lobe of SS 433.
Astrophysical Journal Letters. Roč. 961, č. 1 (2024), č. článku L12. ISSN 2041-8205. E-ISSN 2041-8213
Institutional support: RVO:67985815
Keywords : particle-acceleration * magnetic-fields * shear acceleration
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 7.9, year: 2022
Method of publishing: Open access

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 gamma-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 range12 degrees to +10 degrees (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.
Permanent Link: https://hdl.handle.net/11104/0353266