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Sub-second optical/near-infrared quasi-periodic oscillations from the black hole X-ray transient Swift J1727.8-1613
Univ Southampton, Dept Phys & Astron, Bldg 46, Highfield Campus, Southampton SO17 1BJ, England; Inst Astrofis Canarias IAC, Calle Via Lactea s-n, E-38200 San Cristobal la Laguna, Tenerife, Spain; Univ La Laguna ULL, Dept Astrofis, Ave Astrofis Francisco Sanchez S-N, E-38206 San Cristobal la Laguna, Tenerife, Spain; INAF Osservatorio Astron Roma, Via Frascati 33, I-00076 Monte Porzio Catone, RM, Italy.
Inst Astrofis Canarias IAC, Calle Via Lactea s-n, E-38200 San Cristobal la Laguna, Tenerife, Spain; Univ La Laguna ULL, Dept Astrofis, Ave Astrofis Francisco Sanchez S-N, E-38206 San Cristobal la Laguna, Tenerife, Spain.
INAF Osservatorio Astron Roma, Via Frascati 33, I-00076 Monte Porzio Catone, RM, Italy.
Inst Astrofis Canarias IAC, Calle Via Lactea s-n, E-38200 San Cristobal la Laguna, Tenerife, Spain; Univ Sheffield, Sch Math & Phys Sci, Astrophys Res Cluster, Hicks Bldg, Hounsfield Rd, Sheffield S3 7RH, England.
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2025 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 539, no 3, p. 2347-2361Article in journal (Refereed) Published
Abstract [en]

We report on the detection of optical/near-infrared (O-IR) quasi-periodic oscillations (QPOs) from the black hole (BH) X-ray transient Swift J1727.8-1613. We obtained three X-ray and O-IR high-time-resolution observations of the source during its intermediate state (2023 September 9, 15, and 17) using NICER, HAWK-I@VLT, HIPERCAM@GTC, and ULTRACAM@NTT. We clearly detected a QPO in the X-ray and O-IR bands during all three epochs. The QPO evolved, drifting from 1.4 Hz in the first epoch, up to 2.2 Hz in the second, and finally reaching 4.2 Hz in the third epoch. These are among the highest O-IR QPO frequencies detected for a BH X-ray transient. During the first two epochs, the X-ray and O-IR emission are correlated, with an optical lag (compared to the X-rays) varying from +70 to 0 ms. Finally, during the third epoch, we measured, for the first time, a lag of the z(s) band with respect to the g(s) band at the QPO frequency (approximate to +10 ms). By estimating the variable O-IR SED we find that the emission is most likely non-thermal. Current state-of-the-art models can explain some of these properties, but neither the jet nor the hot flow model can easily explain the observed evolution of the QPOs. While this allowed us to put tight constraints on these components, more frequent coverage of the state transition with fast multiwavelength observations is still needed to fully understand the evolution of the disc/jet properties in BH low-mass X-ray binaries.

Place, publisher, year, edition, pages
Oxford University Press (OUP) , 2025. Vol. 539, no 3, p. 2347-2361
Keywords [en]
accretion, accretion discs, stars: black holes, stars: jets, X-rays: binaries
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-364716DOI: 10.1093/mnras/staf600ISI: 001479181000001Scopus ID: 2-s2.0-105003976738OAI: oai:DiVA.org:kth-364716DiVA, id: diva2:1980020
Note

QC 20250701

Available from: 2025-07-01 Created: 2025-07-01 Last updated: 2025-07-01Bibliographically approved

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Veledina, Alexandra

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