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Discovery of X-Ray Polarization from the Black Hole Transient Swift J1727.8-1613
- 1.0582175 - ASÚ 2024 RIV US eng J - Journal Article
Veledina, A. - Muleri, F. - Dovčiak, Michal - Svoboda, Jiří - Podgorný, Jakub - Karas, Vladimír … Total 116 authors
Discovery of X-Ray Polarization from the Black Hole Transient Swift J1727.8-1613.
Astrophysical Journal Letters. Roč. 958, č. 1 (2023), č. článku L16. ISSN 2041-8205. E-ISSN 2041-8213
R&D Projects: GA ČR(CZ) GX21-06825X
Institutional support: RVO:67985815
Keywords : accretion * X-ray astronomy * low-mass x-ray binary stars
OECD category: Astronomy (including astrophysics,space science)
Impact factor: 7.9, year: 2022
Method of publishing: Open access
We report the first detection of the X-ray polarization of the bright transient Swift J1727.8-1613 with the Imaging X-ray Polarimetry Explorer. The observation was performed at the beginning of the 2023 discovery outburst, when the source resided in the bright hard state. We find a time- and energy-averaged polarization degree of 4.1% ± 0.2% and a polarization angle of 2.°2 ± 1.°3 (errors at 68% confidence level, this translates to ~20σ significance of the polarization detection). This finding suggests that the hot corona emitting the bulk of the detected X-rays is elongated, rather than spherical. The X-ray polarization angle is consistent with that found in submillimeter wavelengths. Since the submillimeter polarization was found to be aligned with the jet direction in other X-ray binaries, this indicates that the corona is elongated orthogonal to the jet.
Permanent Link: https://hdl.handle.net/11104/0350254
File Download Size Commentary Version Access 582175.pdf 1 859 KB Publisher’s postprint open-access
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