Tracking the jet-like corona of black hole Swift J1727.8-1613 during a flare state through Type-C quasi-periodic oscillations

Jie Liao; Ning Chang; Lang Cui; Pengfei Jiang; Didong Mou; Yongfeng Huang; Tao An; Luis C. Ho; Hua Feng; Yu-Cong Fu; Hongmin Cao; Ashutosh Tripathi; Xiang Liu

arXiv · 2410.06574

Tracking the jet-like corona of black hole Swift J1727.8-1613 during a flare state through Type-C quasi-periodic oscillations

Jie Liao·Ning Chang·Lang Cui·Pengfei Jiang·Didong Mou·Yongfeng Huang·Tao An·Luis C. Ho·Hua Feng·Yu-Cong Fu·Hongmin Cao·Ashutosh Tripathi·Xiang Liu

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Abstract

Type-C quasi-periodic oscillations (QPOs) in black hole X-ray transients typically manifest in the low-hard and hard-intermediate states. This study presents a detailed spectral and temporal analysis of the black hole candidate Swift J1727.8-1613 using NICER observations from August and September 2023, with a focus on the first flare period. We detected Type-C QPOs whose centroid frequency increased from 0.33 Hz to 2.63 Hz. An additional increase in frequency was observed when the outburst entered a flare period. The time-averaged spectra, along with the rms and phase-lag spectra of the QPOs, were jointly fitted using the time-dependent Comptonization model vkompthdk to examine the geometry of the corona during this flare. Correlations between spectral and temporal properties suggest that the detected type-C QPOs are primarily modulated by Lense-Thirring precession. Leveraging simultaneous radio observations that indicate discrete jet ejections, we proposed a scenario to describe the co-evolution of the disk-corona-jet during a flare (~3 days). This scenario is partially supported for the first time by polarization data in the soft gamma-ray band from INTEGRAL/IBIS. A phenomenological analysis of the corona scenario was also conducted.

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Jie Liao, Ning Chang, Lang Cui, Pengfei Jiang, Didong Mou, Yongfeng Huang, Tao An, Luis C. Ho, Hua Feng, Yu-Cong Fu, Hongmin Cao, Ashutosh Tripathi, Xiang Liu. 2024-10-09. Tracking the jet-like corona of black hole Swift J1727.8-1613 during a flare state through Type-C quasi-periodic oscillations. https://arxiv.org/abs/2410.06574

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