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Studying temporal variability of GRS 1739-278 during the 2014 outburst
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Number of Authors: 62019 (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
2019. Vol. 482, no 1, p. 1392-1405
Keywords [en]
accretion, accretion discs, X-rays: binaries, X-rays: individual: GRS 1739-278
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:su:diva-165795DOI: 10.1093/mnras/sty2752ISI: 000454575300097OAI: oai:DiVA.org:su-165795DiVA, id: diva2:1288693
Available from: 2019-02-14 Created: 2019-02-14 Last updated: 2019-02-14Bibliographically approved

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Poutanen, Juri
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Nordic Institute for Theoretical Physics (Nordita)
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