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Peer-reviewedCC BY 4.0The Astrophysical Journal

Disk-corona Evolution during the Reflare of MAXI J1348-630 Observed by Insight-HXMT

  • Xiao Chen1,2
  • Hanji Wu2
  • Yongjie Jin2
  • Weiping Liu1,3
  • Wei Wang2
  1. 1Southern University of Science and Technology
  2. 2Wuhan University
  3. 3China Institute of Atomic Energy
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Abstract

MAXI J1348-630, a low-mass black hole X-ray binary, exhibited a major outburst in early 2019 followed by a weaker reflare before returning to quiescence. We analyze Insight-Hard X-ray Modulation Telescope observations of this reflare over MJD 58637–58691 in the 1–100 keV band, together with radio monitoring, to investigate the disk–corona–jet evolution. The X-ray spectral analysis shows that the disk flux and the total coronal-powered flux, defined as the sum of the direct Comptonized continuum and reflected emission, follow a similar rise–plateau–decay pattern, with the latter dominating the X-ray emission. Our interpolated cross-correlation function analysis reveals no robust evidence for a nonzero lag on day timescales between the radio emission and either the X-ray count rates or the decomposed disk and total coronal-powered fluxes. This result is consistent with close coupling among the truncated disk, hot inner flow/corona, and compact jet on day timescales, while minute-to-hour delays remain unresolved. Compared with the ordered multiwavelength evolution observed during the 2019 main outburst, this distinct timing behavior suggests that the reflare is not merely a fainter repetition of the major event, but may instead reflect renewed activity within a residual hard-state–like inner accretion structure, potentially involving a lower-lying or more horizontally extended corona temporally coupled to the compact jet on day timescales.

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Cite

BibTeXRIS
BibTeX
@article{chen2026diskcorona,
  title = {{Disk-corona Evolution during the Reflare of MAXI J1348-630 Observed by Insight-HXMT}},
  author = {Xiao Chen and Hanji Wu and Yongjie Jin and Weiping Liu and Wei Wang},
  journal = {The Astrophysical Journal},
  year = {2026},
  month = oct,
  doi = {10.3847/1538-4357/aea835},
  url = {https://iopscience.iop.org/article/10.3847/1538-4357/aea835},
  note = {CC BY 4.0},
}
RIS
TY  - JOUR
TI  - Disk-corona Evolution during the Reflare of MAXI J1348-630 Observed by Insight-HXMT
AU  - Xiao Chen
AU  - Hanji Wu
AU  - Yongjie Jin
AU  - Weiping Liu
AU  - Wei Wang
PY  - 2026
DA  - 2026/10/09
JO  - The Astrophysical Journal
DO  - 10.3847/1538-4357/aea835
UR  - https://iopscience.iop.org/article/10.3847/1538-4357/aea835
AB  - MAXI J1348-630, a low-mass black hole X-ray binary, exhibited a major outburst in early 2019 followed by a weaker reflare before returning to quiescence. We analyze Insight-Hard X-ray Modulation Telescope observations of this reflare over MJD 58637–58691 in the 1–100 keV band, together with radio monitoring, to investigate the disk–corona–jet evolution. The X-ray spectral analysis shows that the disk flux and the total coronal-powered flux, defined as the sum of the direct Comptonized continuum and reflected emission, follow a similar rise–plateau–decay pattern, with the latter dominating the X-ray emission. Our interpolated cross-correlation function analysis reveals no robust evidence for a nonzero lag on day timescales between the radio emission and either the X-ray count rates or the decomposed disk and total coronal-powered fluxes. This result is consistent with close coupling among the truncated disk, hot inner flow/corona, and compact jet on day timescales, while minute-to-hour delays remain unresolved. Compared with the ordered multiwavelength evolution observed during the 2019 main outburst, this distinct timing behavior suggests that the reflare is not merely a fainter repetition of the major event, but may instead reflect renewed activity within a residual hard-state–like inner accretion structure, potentially involving a lower-lying or more horizontally extended corona temporally coupled to the compact jet on day timescales.
SN  - 0004-637X
SN  - 1538-4357
ER  -