X-ray polarization study of the neutron star low-mass X-ray binary GX 349+2
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866909614208974848 |
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| author | Kashyap, Unnati Maccarone, Thomas J. Ng, Mason Pattie, Eliot C. Ravi, Swati Marshall, Herman L. |
| author_facet | Kashyap, Unnati Maccarone, Thomas J. Ng, Mason Pattie, Eliot C. Ravi, Swati Marshall, Herman L. |
| contents | We report the first X-ray polarimetric results of the neutron star (NS) low-mass X-ray binary (LMXB) Z-source GX 349+2 using the Imaging X-ray Polarimetry Explorer (IXPE). We discovered that the X-ray source was polarized at PD = 1.1 +/- 0.3% (1-sigma errors) with a polarization angle of PA = 32 +/- 6 degree (1-sigma errors). Simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR) observations show that the source transitioned through the normal branch (NB), flaring branch (FB), and soft apex (SA) of the Z-track during our IXPE observations. The X-ray spectro-polarimetry results suggest a source geometry comprising an accretion disk component, a blackbody representing the emission from the NS surface, and a Comptonized component. We discuss the accretion geometry of the Z source in light of the spectro-polarimetric results. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2505_00813 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | X-ray polarization study of the neutron star low-mass X-ray binary GX 349+2 Kashyap, Unnati Maccarone, Thomas J. Ng, Mason Pattie, Eliot C. Ravi, Swati Marshall, Herman L. High Energy Astrophysical Phenomena We report the first X-ray polarimetric results of the neutron star (NS) low-mass X-ray binary (LMXB) Z-source GX 349+2 using the Imaging X-ray Polarimetry Explorer (IXPE). We discovered that the X-ray source was polarized at PD = 1.1 +/- 0.3% (1-sigma errors) with a polarization angle of PA = 32 +/- 6 degree (1-sigma errors). Simultaneous Nuclear Spectroscopic Telescope Array (NuSTAR) observations show that the source transitioned through the normal branch (NB), flaring branch (FB), and soft apex (SA) of the Z-track during our IXPE observations. The X-ray spectro-polarimetry results suggest a source geometry comprising an accretion disk component, a blackbody representing the emission from the NS surface, and a Comptonized component. We discuss the accretion geometry of the Z source in light of the spectro-polarimetric results. |
| title | X-ray polarization study of the neutron star low-mass X-ray binary GX 349+2 |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2505.00813 |