A1 Refereed original research article in a scientific journal
Accretion Onto Weakly Magnetized Neutron Stars: Polarization Theory and Its Application to X-Ray Burster GX 13+1
Authors: Bobrikova, Anna; Forsblom, Sofia V.
Publisher: WILEY-V C H VERLAG GMBH
Publishing place: WEINHEIM
Publication year: 2025
Journal: Astronomical Notes / Astronomische Nachrichten
Journal name in source: ASTRONOMISCHE NACHRICHTEN
Journal acronym: ASTRON NACHR
Article number: e20240128
Volume: 346
Issue: 1
Number of pages: 7
ISSN: 0004-6337
eISSN: 1521-3994
DOI: https://doi.org/10.1002/asna.20240128
Web address : https://onlinelibrary.wiley.com/doi/10.1002/asna.20240128
Self-archived copy’s web address: https://research.utu.fi/converis/portal/detail/Publication/477932579
Observations show that the x-ray emission of the accreting weakly magnetized neutron stars (WMNSs) is polarized. In this article, we summarize the analytical models for the polarized emission of various components of the WMNSs. We introduce a missing theoretical model, where we assume the emission comes from the spreading layer, the extension of the boundary layer between the accretion disk and the neutron star. We show how these models and the results of the simulations provide new insights into the x-ray polarization from weakly magnetized neutron stars observed with the imaging x-ray polarimetry explorer (IXPE). We specifically focus on the most peculiar case of the X-ray burster GX 13+1.
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Funding information in the publication:
This work was supported by Research Council of Finland, 333112, Suomen Kulttuurirahasto, 00240328.
