Discovery of X-Ray Polarization from the Black Hole Transient Swift J1727.8-1613
ASTROPHYSICAL JOURNAL LETTERS(2023)
摘要
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.degrees 2 +/- 1.degrees 3 (errors at 68% confidence level; this translates to similar to 20 sigma 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.
更多查看译文
关键词
Accretion,X-ray astronomy,Low-mass x-ray binary stars,Polarimetry,Astrophysical black holes
AI 理解论文
溯源树
样例
生成溯源树,研究论文发展脉络
Chat Paper
正在生成论文摘要