X-ray spectro-polarimetric characterization of GX 340+0 in the horizontal branch: a highly inclined source?
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arXiv
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| Auteurs principaux: | , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916488977317888 |
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| author | La Monaca, Fabio Di Marco, Alessandro Ludlam, Renee M. Bobrikova, Anna Poutanen, Juri Li, Songwei Xie, Fei |
| author_facet | La Monaca, Fabio Di Marco, Alessandro Ludlam, Renee M. Bobrikova, Anna Poutanen, Juri Li, Songwei Xie, Fei |
| contents | 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 ${\sim}40°$. 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°, as expected for Cyg-like sources, in contrast with results we report for the reflection component using broad-band spectrum. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2410_00972 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | X-ray spectro-polarimetric characterization of GX 340+0 in the horizontal branch: a highly inclined source? La Monaca, Fabio Di Marco, Alessandro Ludlam, Renee M. Bobrikova, Anna Poutanen, Juri Li, Songwei Xie, Fei High Energy Astrophysical Phenomena 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 ${\sim}40°$. 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°, as expected for Cyg-like sources, in contrast with results we report for the reflection component using broad-band spectrum. |
| title | X-ray spectro-polarimetric characterization of GX 340+0 in the horizontal branch: a highly inclined source? |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2410.00972 |