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X-ray spectro-polarimetric characterization of GX 340+0 in the horizontal branch: a highly inclined source?

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arxiv 2410.00972 v2 pith:3MD6OYLF submitted 2024-10-01 astro-ph.HE

Fabio La Monaca , Alessandro Di Marco , Renee M. Ludlam , Anna Bobrikova , Juri Poutanen , Songwei Li , Fei Xie This is my paper
classification astro-ph.HE
keywords polarizationbranchcomponentshorizontalobtainedx-rayaxisbroad-band
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abstract

We report the first detection of X-ray polarization in the horizontal branch for GX 340+0 as obtained by Imaging X-ray Polarimetry Explorer (IXPE). A polarization degree of 4.3%$\pm$0.3% is obtained. This value is in agreement with the previous polarization measurements of Z-sources in the horizontal branch. Spectro-polarimetric analysis, performed using a broad-band spectral model obtained by NICER and NuSTAR quasi-simultaneous observations, allowed us to constrain the polarization for the soft and hard spectral components typical to these sources. The polarization angle for the two components differs by ${\sim}40{\deg}$. This result could be explained by a misalignment of the NS rotations axis with respect to the accretion disk axis. We provide a comparison of the results with polarization expected in different models. Theoretical expectations for the polarization of the disk and the Comptonization components favor an orbital inclination for GX 340+0 higher than 60{\deg}, as expected for Cyg-like sources, in contrast with results we report for the reflection component using broad-band spectrum.

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Cited by 3 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Peering through the dip: IXPE unveils the extended scattering environment of GX 13+1

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    During the periodic dip of GX 13+1, X-ray polarization rises to 9.1%±1.1% and rotates by ~60° relative to the off-dip state, consistent with scattering in an oblate corona or disk wind.

  2. Unchanged X-Ray Polarization During Accretion Dips in the Low Hard State of Cygnus X-1

    astro-ph.HE 2026-07 conditional novelty 6.0 of 10

    During Cygnus X-1 accretion dips the 2–8 keV polarization is unchanged within errors, indicating the absorbed disk does not contribute and supporting an extended oblate corona.

  3. The Structure of the Relativistic Fe Line in GX 340+0 as Viewed with XRISM/Resolve, NICER, and NuSTAR

    astro-ph.HE 2025-07 conditional novelty 6.0 of 10

    The Fe K line of GX 340+0 shows a dual-peaked structure with residual narrow emission features at the ~5% level that RELXILLNS reflection modeling alone does not reproduce.

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