Bibliographic Details
| Title: |
Spectral analysis of the X-ray flares in the 2023 outburst of the new black binary transient Swift J1727.8--1613 observed with Insight-HXMT |
| Authors: |
Cao, Jia-Ying, Liao, Jin-Yuan, Zhang, Shuang-Nan, Feng, Hua, Qu, Jin-Lu, Zhang, Liang, Liu, He-Xin, Yu, Wei, Zhao, Qing-Chang, Peng, Jing-Qiang, Ge, Ming-Yu, Tao, Lian, Xu, Yan-Jun, Zhang, Shu, Yang, Zi-Xu |
| Publication Year: |
2025 |
| Collection: |
Astrophysics |
| Subject Terms: |
Astrophysics - High Energy Astrophysical Phenomena |
| More Details: |
The new black hole transient Swift J1727.8--1613 exhibited a series of X-ray flares during its 2023 outburst extensively observed with Insight-HXMT. We analyze the spectra of the flaring period using a series of models consisting of a multi-color disk and several different non-thermal components, and several consistent conclusions are obtained among these models. First, Swift J1727.8--1613 was in the transition process from the hard intermediate state (HIMS) to the very high state (VHS) during the first flaring period (MJD 60197--60204), and afterwards it exhibited typical VHS parameter characteristics, such as high temperature of the disk inner radius and a steep power-law spectrum with a photon index of 2.6. Second, the flares in the VHS are characterized by a rapid increase in the flux of accretion disk, accompanied by a simultaneous rapid expansion of the inner radius, which could be apparent if the accretion disk hardening factor varies significantly. The strong power-law component during the VHS is likely produced by synchrotron self-Compton process in the relativistic jets, in agreement with the observed weak reflection component and lack of correlation with the disk component.
Comment: The manuscript has been accepted for publication in The Astrophysical Journal |
| Document Type: |
Working Paper |
| Access URL: |
http://arxiv.org/abs/2503.05411 |
| Accession Number: |
edsarx.2503.05411 |
| Database: |
arXiv |
