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Peer-reviewedCC BYMonthly Notices of the Royal Astronomical Society

The broad-band X-ray spectral properties during the rising phases of the outburst of the new black hole X-ray binary candidate Swift J1727.8–1613

  • He-Xin Liu1,2,3,4
  • Yan-Jun Xu4,5
  • Wei Yu6
  • Shuang‐Nan Zhang4,5
  • Jin-Lu Qu4,5
6 affiliations
  1. 1Department of Physics and Astronomy, QingHai University , Xining 810016 ,
  2. 2Dongguan Neutron Science Center , Zhongziyuan Road, Dongguan 523808 ,
  3. 3Research Center of Astronomy, QingHai University , Xining 810016 ,
  4. 4State Key Laboratory of Particle Astrophysics, Institute of High Energy Physics, Chinese Academy of Sciences , 19B Yuquan Road, Beijing 100049 ,
  5. 5University of Chinese Academy of Sciences, Chinese Academy of Sciences , Beijing 100049 ,
  6. 6Institut für Astronomie und Astrophysik, Kepler Center for Astro and Particle Physics, Eberhard Karls Universität , D-72076 Tübingen ,
Open at sourceDOICite

Abstract

We report data analysis results about the outburst evolution and spectral properties during the hard state of the recently discovered X-ray transient Swift J1727.8–163 as observed by Insight-HXMT. The broad-band X-ray spectrum of Swift J1727.8–163 is more complex than the most typical spectral patterns of black hole X-ray binary systems, with not only a comparatively weaker reflection component but also an additional high-energy component, manifesting itself as a hard X-ray tail beyond the thermal Comptonization description detectable below 100 keV. Using reflection models combining thermal (reflkerr) and hybrid (reflkerr_bb) Comptonization, we find that the emission arises from a plasma containing both thermal and non-thermal electrons, with the non-thermal tail forming a smooth extension of the thermal continuum. This supports a compact hybrid corona. We find that the inner disc radius remains at the Innermost Stable Circular Orbit and the reflection fraction stays low, with no abrupt spectral evolution across epochs. These results highlight the role of hybrid corona in shaping hard-state emission in black hole X-ray binaries.

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Cite

BibTeXRIS
BibTeX
@article{liu2026broadband,
  title = {{The broad-band X-ray spectral properties during the rising phases of the outburst of the new black hole X-ray binary candidate Swift J1727.8–1613}},
  author = {He-Xin Liu and Yan-Jun Xu and Wei Yu and Shuang‐Nan Zhang and Jin-Lu Qu},
  journal = {Monthly Notices of the Royal Astronomical Society},
  year = {2026},
  month = may,
  doi = {10.1093/mnras/stag999},
  url = {https://doi.org/10.1093/mnras/stag999},
  note = {CC BY},
}
RIS
TY  - JOUR
TI  - The broad-band X-ray spectral properties during the rising phases of the outburst of the new black hole X-ray binary candidate Swift J1727.8–1613
AU  - He-Xin Liu
AU  - Yan-Jun Xu
AU  - Wei Yu
AU  - Shuang‐Nan Zhang
AU  - Jin-Lu Qu
PY  - 2026
DA  - 2026/05/28
JO  - Monthly Notices of the Royal Astronomical Society
DO  - 10.1093/mnras/stag999
UR  - https://doi.org/10.1093/mnras/stag999
AB  - We report data analysis results about the outburst evolution and spectral properties during the hard state of the recently discovered X-ray transient Swift J1727.8–163 as observed by Insight-HXMT. The broad-band X-ray spectrum of Swift J1727.8–163 is more complex than the most typical spectral patterns of black hole X-ray binary systems, with not only a comparatively weaker reflection component but also an additional high-energy component, manifesting itself as a hard X-ray tail beyond the thermal Comptonization description detectable below 100 keV. Using reflection models combining thermal (reflkerr) and hybrid (reflkerr_bb) Comptonization, we find that the emission arises from a plasma containing both thermal and non-thermal electrons, with the non-thermal tail forming a smooth extension of the thermal continuum. This supports a compact hybrid corona. We find that the inner disc radius remains at the Innermost Stable Circular Orbit and the reflection fraction stays low, with no abrupt spectral evolution across epochs. These results highlight the role of hybrid corona in shaping hard-state emission in black hole X-ray binaries.
SN  - 0035-8711
SN  - 1365-2966
SN  - 1365-8711
ER  -