Multiwavelength View of Black Hole X-ray Binary Swift J151857.0-572147

@misc{mandal2026multiwavelength,
  title = {{Multiwavelength View of Black Hole X-ray Binary Swift J151857.0-572147}},
  author = {Manoj Mandal and Sachindra Naik and Souvik Manik and Sabyasachi Pal},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.02681},
  eprint = {2609.02681},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.02681},
}

TY  - UNPB
TI  - Multiwavelength View of Black Hole X-ray Binary Swift J151857.0-572147
AU  - Manoj Mandal
AU  - Sachindra Naik
AU  - Souvik Manik
AU  - Sabyasachi Pal
PY  - 2026
DA  - 2026/09/03
PB  - arXiv
DO  - 10.48550/arxiv.2609.02681
UR  - https://arxiv.org/abs/2609.02681
AB  - We investigate multiwavelength timing and spectral properties of the newly discovered black hole X-ray binary Swift J151857.0-572147 during its 2024 outburst using observations from AstroSat, NuSTAR, NICER, Swift, and MeerKAT. The AstroSat/LAXPC20 power density spectrum reveals a ∼8 Hz low-frequency QPO with a quality factor of ∼2.8. The broadband X-ray spectrum of the source exhibits prominent reflection features, which are modeled to constrain the geometry and physical properties of the accretion disk. The spectral analysis indicates that the source was in the soft/intermediate spectral state, characterized by a steep power law with a photon index of Γ≈ 2.6 and a relatively high disk temperature of ∼0.9 keV. The reflection modeling suggests a disk inclination of 23−31^∘ and a highly ionized accretion disk with logξ∼ 3.3-4.0. The MeerKAT monitoring revealed a strong radio variability that closely tracked the hard X-ray evolution, including a bright radio flare during the hard-to-soft state transition, supporting close coupling between the accretion flow and jet activity. Using the quasi-simultaneous AstroSat, Swift/XRT and MeerKAT observations, we investigated the radio/X-ray correlation and found that Swift J151857.0-572147 follows the established L_X-L_R relation for Galactic black hole X-ray binaries. Its location in the L_X-L_R plane is consistent with that of Galactic black hole X-ray binaries, further supporting its black hole nature.
ER  -