X-ray and Radio Campaign of the Z-source GX 340+0 II: the X-ray polarization in the normal branch
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| Natura: | Preprint |
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2024
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| author | Bhargava, Yash Russell, Thomas D. Ng, Mason Balasubramanian, Arvind Zhang, Liang Ravi, Swati Jadoliya, Vishal Bhattacharyya, Sudip Pahari, Mayukh Homan, Jeroen Marshall, Herman L. Chakrabarty, Deepto Carotenuto, Francesco Kaushik, Aman |
| author_facet | Bhargava, Yash Russell, Thomas D. Ng, Mason Balasubramanian, Arvind Zhang, Liang Ravi, Swati Jadoliya, Vishal Bhattacharyya, Sudip Pahari, Mayukh Homan, Jeroen Marshall, Herman L. Chakrabarty, Deepto Carotenuto, Francesco Kaushik, Aman |
| contents | We present the first X-ray polarization measurement of the neutron star low-mass X-ray binary and Z-source, GX 340$+$0, in the normal branch (NB) using a 200 ks observation with the Imaging X-ray Polarimetric Explorer (IXPE). This observation was performed in 2024 August. Along with IXPE, we also conducted simultaneous observations with NICER, AstroSat, Insight-HXMT, ATCA, and GMRT to investigate the broadband spectral and timing properties in the X-ray and radio wavelengths. During the campaign, the source traced a complete Z-track during the IXPE observation but spent most of the time in the NB. We measure X-ray polarization degree (PD) of $1.22\pm0.25\%$ in the 2-8 keV energy band with a polarization angle (PA) of $38\pm6^\circ$. The PD in the NB is observed to be weaker than in the horizontal branch (HB) but aligned in the same direction. The PD of the source exhibits a marginal increase with energy while the PA shows no energy dependence. The joint spectro-polarimetric modeling is consistent with the observed X-ray polarization originating from a single spectral component from the blackbody or the Comptonized emission while the disk emission does not contribute towards the X-ray polarization. GMRT observations at 1.26 GHz during HB had a tentative detection at 4.5$\pm$0.7 mJy while ATCA observations a day later during the NB detected the source at 0.70$\pm$0.05 mJy and 0.59$\pm$0.05 mJy in the 5.5 & 9 GHz bands, respectively, suggesting an evolving jet structure depending on the Z-track position. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_00350 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | X-ray and Radio Campaign of the Z-source GX 340+0 II: the X-ray polarization in the normal branch Bhargava, Yash Russell, Thomas D. Ng, Mason Balasubramanian, Arvind Zhang, Liang Ravi, Swati Jadoliya, Vishal Bhattacharyya, Sudip Pahari, Mayukh Homan, Jeroen Marshall, Herman L. Chakrabarty, Deepto Carotenuto, Francesco Kaushik, Aman High Energy Astrophysical Phenomena We present the first X-ray polarization measurement of the neutron star low-mass X-ray binary and Z-source, GX 340$+$0, in the normal branch (NB) using a 200 ks observation with the Imaging X-ray Polarimetric Explorer (IXPE). This observation was performed in 2024 August. Along with IXPE, we also conducted simultaneous observations with NICER, AstroSat, Insight-HXMT, ATCA, and GMRT to investigate the broadband spectral and timing properties in the X-ray and radio wavelengths. During the campaign, the source traced a complete Z-track during the IXPE observation but spent most of the time in the NB. We measure X-ray polarization degree (PD) of $1.22\pm0.25\%$ in the 2-8 keV energy band with a polarization angle (PA) of $38\pm6^\circ$. The PD in the NB is observed to be weaker than in the horizontal branch (HB) but aligned in the same direction. The PD of the source exhibits a marginal increase with energy while the PA shows no energy dependence. The joint spectro-polarimetric modeling is consistent with the observed X-ray polarization originating from a single spectral component from the blackbody or the Comptonized emission while the disk emission does not contribute towards the X-ray polarization. GMRT observations at 1.26 GHz during HB had a tentative detection at 4.5$\pm$0.7 mJy while ATCA observations a day later during the NB detected the source at 0.70$\pm$0.05 mJy and 0.59$\pm$0.05 mJy in the 5.5 & 9 GHz bands, respectively, suggesting an evolving jet structure depending on the Z-track position. |
| title | X-ray and Radio Campaign of the Z-source GX 340+0 II: the X-ray polarization in the normal branch |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2411.00350 |