A possible jet and corona configuration for Swift J1727.8--1613 during the hard state

Abstract

Swift J1727.8--1613 is a black hole X-ray binary that differs from other black hole X-ray binaries in that it has an extra hard component in addition to a reflection component. We perform spectral analysis with simultaneous Insight-HXMT, NICER and NuSTAR observations when the source was in the hard and hard intermediate states. For the presentation of the extra components, we investigate the correlation between the relxill parameters. We find that the correlation between the spectral index and the reflection fraction is consistent with MAXI J1820+070 when the jet dominates the reflection. This provides the second sample to have such a correlation during an outburst. Interestingly, when the reflection component is attributed to the corona, the spectral fit results in a small reflection fraction and the correlation between the spectral index and reflection fraction is in agreement with the overall trend built-in You et al. 2023 with a large sample of outbursts from other X-ray binaries. Hence Swift J1727.8--1613 turns out to be the first sample to bridge the MAXI J1820+070 to the majority of X-ray binaries according to the dual correlations observed between the spectral index and the reflection fraction. We speculate that a configuration of a jet plus a hot inner flow may account for this peculiar outburst behavior of Swift J1727.8--1613.

12 pages, 4 figures, 4 tables. Published in JHEAp

References in corpus (10)

• Insight-HXMT observations of jet-like corona in a black hole X-ray binary MAXI J1820+070
• NICER, NuSTAR and Insight-HXMT views to the newly discovered black hole X-ray binary Swift J1727.8--1613
• Swift J1727.8-1613 has the Largest Resolved Continuous Jet Ever Seen in an X-ray Binary
• Hybrid Comptonization and Electron-Positron Pair Production in the Black-Hole X-Ray Binary MAXI J1820+070
• 21 new long-term variables in the GX 339-4 field: two years of MeerKAT monitoring
• Insight-HXMT observations of a possible fast transition from jet to wind dominated state during a huge flare of GRS~1915+105
• A broadband radio view of transient jet ejecta in the black hole candidate X-ray binary MAXI J1535-571
• Multi-wavelength spectroscopy of the black hole candidate MAXI J1813-095 during its discovery outburst
• X-ray spectral correlations in a sample of Low-mass black hole X-ray binaries in the hard state
• INTEGRAL/IBIS polarization detection in the hard and soft intermediate states of Swift J1727.8-1613