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Polarized radiation from the spreading layer of weakly magnetized neutron stars
Tekijät: Bobrikova, Anna; Poutanen, Juri; Loktev, Vladislav
Kustantaja: EDP Sciences
Kustannuspaikka: LES ULIS CEDEX A
Julkaisuvuosi: 2025
Journal: Astronomy and Astrophysics
Tietokannassa oleva lehden nimi: Astronomy & Astrophysics
Lehden akronyymi: ASTRON ASTROPHYS
Artikkelin numero: A181
Vuosikerta: 696
Sivujen määrä: 9
ISSN: 0004-6361
eISSN: 1432-0746
DOI: https://doi.org/10.1051/0004-6361/202452358
Verkko-osoite: https://doi.org/10.1051/0004-6361/202452358
Rinnakkaistallenteen osoite: https://research.utu.fi/converis/portal/detail/Publication/491827697
Observations show that the X-ray emission of the accreting weakly magnetized neutron stars is polarized. We developed a theoretical model for polarized radiation from the spreading layer, which is the extension of the accretion flow boundary layer onto the neutron star surface. We calculated the Stokes parameters of the radiation and accounted for relativistic aberration and gravitational light bending in the Schwarzschild metric. We show that regardless of the geometry, the polarization degree of the spreading layer does not exceed 1.5%. Our results have implications with regard to the understanding of the X-ray polarization from weakly magnetized neutron stars observed with the Imaging X-ray Polarimetry Explorer and the future enhanced X-ray Timing and Polarimetry mission.
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This research was supported by the Academy of Finland grant 333112, and the grants 002200175 and 00240328 of the Finnish Cultural Foundation (AB).
