NICER, NuSTAR and Insight-HXMT views to the newly discovered black hole X-ray binary Swift J1727.8--1613

Abstract

Swift J1727.8--1613 is a black hole X-ray binary newly discovered in 2023. We perform spectral analysis with simultaneous Insight-HXMT, NICER and NuSTAR observations when the source was approaching to the hard intermediate state. Such a joint view reveals an additional hard component apart from the normally observed hard component with reflection in the spectrum, to be distinguished from the usual black hole X-ray binary systems. By including this extra component in the spectrum, we have measured a high spin of $0.98_{-0.07}^{+0.02}$ and an inclination of around $40_{-0.8}^{+1.2}$ degrees, which is consistent with NICER results reported before. However, we find that the additional spectral component can not be exclusively determined due to the model degeneracy. Accordingly, a possible jet/corona configuration is adjusted to account for the spectral fitting with different model trials. The extra component may originate either from a relativistic jet or a jet base/corona underneath a slow jet.

13 pages, 7 figures, 4 tables. Published in ApJ Letters

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Cited by in corpus (12)

• Dramatic Drop in the X-Ray Polarization of Swift J1727.8$-$1613 in the Soft Spectral State
• Recovery of the X-ray polarisation of Swift J1727.8$-$1613 after the soft-to-hard spectral transition
• A broadband spectral-timing study of QPOs in the bright black hole X-ray binary Swift J1727.8-1613
• {\it Insight}-HXMT View of the BHC Swift J1727.8-1613 during its outburst in 2023
• NICER, NuSTAR and Insight-HXMT views to black hole X-ray binary SLX 1746--331
• NICER and Swift/XRT monitoring of the 2023 outburst of Swift J1727.7-1613
• Comprehensive Radio Monitoring of the Black Hole X-ray Binary Swift J1727.8$-$1613 during its 2023$-$2024 Outburst
• Modeling fast X-ray variability around an accreting black hole
• A possible jet and corona configuration for Swift J1727.8--1613 during the hard state
• Monte Carlo simulation of the Compton scattering and disk reflection of a cylinder with hot electrons moving away from a black hole
• Search for the Highest-energy Quasiperiodic Oscillation in the Black Hole X-Ray Binary Candidate Swift J1727.8-1613
• An Insight-HXMT View of the Evolution of the Type-C Quasiperiodic Oscillation during the Flaring State of Swift J1727.8-1613