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Hard X-rays and QPO in Swift J1727.8-1613: the rise and plateau of the 2023 outburst

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arxiv 2310.06697 v1 pith:I5HBGFD6 submitted 2023-10-10 astro-ph.HE

I. Mereminskiy (1) , A. Lutovinov (1) , S. Molkov (1) , R. Krivonos (1) , A. Semena (1) , S. Sazonov (1) , A. Tkachenko (1) , R. Sunyaev (1
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2) ((1) IKI RAS Moscow Russia (2) MPA Garching Germany)
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We report on the detection of type-C quasi-periodic oscillations during the initial stages of the outburst of Swift J1727.8-1613 in 2023. Using data of the INTEGRAL observatory along with the data of the SRG/ART-XC and Swift/XRT telescopes the fast growth of the QPO frequency was traced. We present a hard X-ray lightcurve that covers the initial stages of the 2023 outburst - the fast rise and plateau - and demonstrate that the QPO frequency was stable during the plateau. The switching from type-C to type-B QPO was detected with the beginning of the source flaring activity. We have constructed a broad-band spectrum of Swift J1727.8-1613 and found an additional hard power-law spectral component extending at least up to 400 keV. Finally, we have obtained an upper limit on the hard X-ray flux at the beginning of the optical outburst and estimated the delay of the X-ray outburst with respect to the optical one.

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Cited by 2 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Spectropolarimetric detection of baryonic mass loading in a transient relativistic jet: application to the black hole X-ray binary Swift J1727.8$-$1613

    astro-ph.HE 2026-07 conditional novelty 7.0 of 10

    Transient Faraday-complex spectropolarimetric structure detected during radio flaring of Swift J1727 implies internal Faraday rotation from electron-proton jet plasma with rotating mass ~10^21 g, a small fraction of a...

  2. Temporal evolution of quasi-periodic oscillations in an accreting black hole Swift J1727.8-1613: coevolution of the disk-corona during the state transition

    astro-ph.HE 2025-06 conditional novelty 5.0 of 10

    QPO frequency in Swift J1727.8-1613 shows a two-branch correlation with disk luminosity, negative below about 3 Hz and positive above.

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