Broadband X-Ray Spectral and Timing Analyses of the Black Hole Binary Candidate Swift J1658.2–4242: Rapid Flux Variation and the Turn-on of a Transient QPO

@article{Xu2019BroadbandXS,
  title={Broadband X-Ray Spectral and Timing Analyses of the Black Hole Binary Candidate Swift J1658.2–4242: Rapid Flux Variation and the Turn-on of a Transient QPO},
  author={Yanjun Xu and Fiona A. Harrison and John A. Tomsick and Didier Barret and Poshak Gandhi and Javier A. Garc{\'i}a and Jonathan M. Miller and Phil Uttley and Dominic J. Walton},
  journal={The Astrophysical Journal},
  year={2019},
  volume={879}
}
We report results from joint Nuclear Spectroscopic Telescope Array, Swift, and XMM-Newton observations of the newly discovered black hole X-ray binary candidate Swift J1658.2–4242 in the intermediate state. We observe a peculiar event in this source, with its X-ray flux rapidly decreasing by ∼45% in ∼40 s, accompanied by only subtle changes in the shape of the broadband X-ray spectrum. In addition, we find a sudden turn-on of a transient quasi-periodic oscillation (QPO) with a frequency of 6–7… 

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