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Studying temporal variability of GRS 1739-278 during the 2014 outburst
Russian Acad Sci, Space Res Inst, Profsoyuznaya 84-32, Moscow 117997, Russia..
Russian Acad Sci, Space Res Inst, Profsoyuznaya 84-32, Moscow 117997, Russia..
Russian Acad Sci, Space Res Inst, Profsoyuznaya 84-32, Moscow 117997, Russia.;Bauman Moscow State Tech Univ, Baumanskaya 2, Moscow 105005, Russia..
Russian Acad Sci, Space Res Inst, Profsoyuznaya 84-32, Moscow 117997, Russia..
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2019 (English)In: Monthly notices of the Royal Astronomical Society, ISSN 0035-8711, E-ISSN 1365-2966, Vol. 482, no 1, p. 1392-1405Article in journal (Refereed) Published
Abstract [en]

We report a discovery of low-frequency quasi-periodic oscillation at 0.3-0.7 Hz in the power spectra of the accreting black hole GRS 1739-278 in the hard-intermediate state during its 2014 outburst based on the NuSTAR and Swift/XRT data. The QPO frequency strongly evolved with the source flux during the NuSTAR observation. The source spectrum became softer with rising QPO frequency and simultaneous increasing of the power-law index and decreasing of the cut-off energy. In the power spectrum, a prominent harmonic is clearly seen together with the main QPO peak. The fluxes in the soft and the hard X-ray bands are coherent, however, the coherence drops for the energy bands separated by larger gaps. The phase lags are generally positive (hard) in the 0.1-3 Hz frequency range, and negative below 0.1 Hz. The accretion disc inner radius estimated with the relativistic reflection spectral model appears to be R-in < 7.3R(g). In the framework of the relativistic precession model, in order to satisfy the constraints from the observed QPO frequency and the accretion disc truncation radius, a massive black hole with M-BH a parts per thousand 100 M-aS (TM) is required.

Place, publisher, year, edition, pages
OXFORD UNIV PRESS , 2019. Vol. 482, no 1, p. 1392-1405
Keywords [en]
accretion, accretion discs, X-rays: binaries, X-rays: individual: GRS 1739-278
National Category
Astronomy, Astrophysics and Cosmology
Identifiers
URN: urn:nbn:se:kth:diva-241322DOI: 10.1093/mnras/sty2752ISI: 000454575300097Scopus ID: 2-s2.0-85057162074OAI: oai:DiVA.org:kth-241322DiVA, id: diva2:1282538
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QC 20190125

Available from: 2019-01-25 Created: 2019-01-25 Last updated: 2019-01-25Bibliographically approved

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Poutanen, Juri

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