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The IXPE View of Neutron Star Low-Mass X-ray Binaries

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arxiv 2409.07161 v1 pith:CNPQNIFC submitted 2024-09-11 astro-ph.HE astro-ph.SR

The IXPE View of Neutron Star Low-Mass X-ray Binaries

Francesco Ursini , Andrea Gnarini , Fiamma Capitanio , Anna Bobrikova , Massimo Cocchi , Alessandro Di Marco , Sergio Fabiani , Ruben Farinelli
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Fabio La Monaca John Rankin Mary Lynne Saade Juri Poutanen
This is my paper
classification astro-ph.HE astro-ph.SR
keywords x-rayixpens-lmxbssourcesbinarieslow-massneutronaccretion
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Low-mass X-ray binaries hosting weakly magnetized neutron stars (NS-LMXBs) are among the brightest sources in the X-ray sky. Since 2021, the Imaging X-ray Polarimetry Explorer (IXPE) has provided new measurements of the X-ray polarization of these sources. IXPE observations have revealed that most NS-LMXBs are significantly polarized in the X-rays, providing unprecedented insight into the geometry of their accretion flow. In this review paper, we summarize the first results obtained by IXPE on NS-LMXBs, the emerging trends within each class of sources (atoll/Z), and possible physical interpretations.

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  1. X-ray polarization of Z-type neutron star low-mass X-ray binaries -- II. Spectropolarimetric analysis

    astro-ph.HE 2026-07 conditional novelty 6.0

    The Comptonized component in Z-type neutron-star X-ray binaries is polarized at 3–6% (up to ~6% in the horizontal branch), exceeding spreading-layer model predictions, while disk polarization stays below ~4% with a no...