X-ray polarization properties of thermal-radiative disc winds in binary systems

Tomaru, Ryota; Done, Chris; Odaka, Hirokazu

Abstract

New X-ray polarization results are challenging our understanding of the accretion flow geometry in black hole binary systems. Even spectra dominated by a standard disc can give unexpected results, such as the high-inclination black hole binary 4U 1630−472, where the observed X-ray polarization is much higher than predicted. This system also shows a strong, highly ionized wind, consistent with thermal-radiative driving from the outer disc, leading to speculation that scattering in the wind is responsible for the unexpectedly high polarization degree from a standard optically thick disc. Here, we show that this is not the case. The optically thin(ish) wind polarizes the scattered light in a direction orthogonal to that predicted from a standard optically thick disc, reducing about 2 per cent rather than enhancing the predicted polarization of the total emission. This value is consistent with the polarization difference between the disc-dominated soft state, where absorption lines by the wind are clearly seen, and the steep power-law state, where no absorption lines are seen. If this difference is genuinely due to the presence or absence of wind, the total polarization direction must be orthogonal to the disc plane rather than parallel as expected from optically thick material.

Citation

Tomaru, R., Done, C., & Odaka, H. (2024). X-ray polarization properties of thermal-radiative disc winds in binary systems. Monthly Notices of the Royal Astronomical Society, 527(3), 7047–7054. https://doi.org/10.1093/mnras/stad3649

• Journal Article Type: Article
• Acceptance Date: Nov 22, 2023
• Online Publication Date: Nov 24, 2023
• Publication Date: 2024-01
• Deposit Date: Feb 1, 2024
• Publicly Available Date: Feb 1, 2024
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 527
• Issue: 3
• Pages: 7047–7054
• DOI: https://doi.org/10.1093/mnras/stad3649
• Public URL: https://durham-repository.worktribe.com/output/2189093
• Publisher URL: https://doi.org/10.1093/mnras/stad3649