X-ray and Radio campaign of the Z-source GX 340+0: discovery of X-ray polarization and its implications
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2024
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| author | Bhargava, Yash Ng, Mason Zhang, Liang Balasubramanian, Arvind Russell, Thomas D. Kaushik, Aman Jadoliya, Vishal Ravi, Swati Bhattacharyya, Sudip Pahari, Mayukh Homan, Jeroen Marshall, Herman L. Chakrabarty, Deepto Carotenuto, Francesco |
| author_facet | Bhargava, Yash Ng, Mason Zhang, Liang Balasubramanian, Arvind Russell, Thomas D. Kaushik, Aman Jadoliya, Vishal Ravi, Swati Bhattacharyya, Sudip Pahari, Mayukh Homan, Jeroen Marshall, Herman L. Chakrabarty, Deepto Carotenuto, Francesco |
| contents | We present the discovery of X-ray polarization from the neutron star low-mass X-ray binary and Z-source, GX~340$+$0, using an Imaging X-ray Polarimetry Explorer (IXPE) observation in March 2024. Along with the IXPE observation, we conducted an extensive X-ray and radio monitoring campaign to ascertain the source properties during and around the IXPE observation. The source was within the horizontal branch throughout the multiwavelength campaign. We measured a significant X-ray polarization in 2--8 keV with polarization degree (PD) = $4.02 \pm 0.35$% and polarization angle (PA) = $37.6 \pm 2.5^\circ$. The energy-dependent polarization indicates that in the 2-2.5 keV energy range, the PA is much lower, $\sim9\pm8^\circ$, while other energy bands are consistent with the PA found over 2.5--8 keV. The simultaneous AstroSat-IXPE spectro-polarimetric observations provide some evidence for independent polarization from various spectral components, hinting at a disparity in the PA from the accretion disk and the Comptonized emission, while suggesting an unpolarized emission from the blackbody component. Radio observations in the 0.7--9 GHz frequency range reveal a non-detection of radio emission in 0.7-1.5 GHz and a significant detection in 5.5--9 GHz, suggesting the presence of a spectral break in 1.5-5.5 GHz. Using ATCA observation we place upper limits on the radio polarization at $<$6% on the linear polarization and $<$4% on the circular polarization at 3$σ$ level. We discuss the origin of the X-ray polarization and its implications on the geometry of the spectral components. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_19324 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | X-ray and Radio campaign of the Z-source GX 340+0: discovery of X-ray polarization and its implications Bhargava, Yash Ng, Mason Zhang, Liang Balasubramanian, Arvind Russell, Thomas D. Kaushik, Aman Jadoliya, Vishal Ravi, Swati Bhattacharyya, Sudip Pahari, Mayukh Homan, Jeroen Marshall, Herman L. Chakrabarty, Deepto Carotenuto, Francesco High Energy Astrophysical Phenomena We present the discovery of X-ray polarization from the neutron star low-mass X-ray binary and Z-source, GX~340$+$0, using an Imaging X-ray Polarimetry Explorer (IXPE) observation in March 2024. Along with the IXPE observation, we conducted an extensive X-ray and radio monitoring campaign to ascertain the source properties during and around the IXPE observation. The source was within the horizontal branch throughout the multiwavelength campaign. We measured a significant X-ray polarization in 2--8 keV with polarization degree (PD) = $4.02 \pm 0.35$% and polarization angle (PA) = $37.6 \pm 2.5^\circ$. The energy-dependent polarization indicates that in the 2-2.5 keV energy range, the PA is much lower, $\sim9\pm8^\circ$, while other energy bands are consistent with the PA found over 2.5--8 keV. The simultaneous AstroSat-IXPE spectro-polarimetric observations provide some evidence for independent polarization from various spectral components, hinting at a disparity in the PA from the accretion disk and the Comptonized emission, while suggesting an unpolarized emission from the blackbody component. Radio observations in the 0.7--9 GHz frequency range reveal a non-detection of radio emission in 0.7-1.5 GHz and a significant detection in 5.5--9 GHz, suggesting the presence of a spectral break in 1.5-5.5 GHz. Using ATCA observation we place upper limits on the radio polarization at $<$6% on the linear polarization and $<$4% on the circular polarization at 3$σ$ level. We discuss the origin of the X-ray polarization and its implications on the geometry of the spectral components. |
| title | X-ray and Radio campaign of the Z-source GX 340+0: discovery of X-ray polarization and its implications |
| topic | High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2405.19324 |