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http://hdl.handle.net/20.500.12386/26621
Titolo: | Detection of Very Low-frequency, Quasi-periodic Oscillations in the 2015 Outburst of V404 Cygni | Autori: | Huppenkothen, D. Younes, G. Ingram, A. Kouveliotou, C. Göğüș, E. BACHETTI, Matteo Sánchez-Fernández, C. Chenevez, J. Motta, S. van der Klis, M. Granot, J. Gehrels, N. Kuulkers, E. Tomsick, J. A. Walton, D. J. |
Data pubblicazione: | 2017 | Rivista: | THE ASTROPHYSICAL JOURNAL | Numero: | 834 | Fascicolo: | 1 | Da pagina:: | 90 | Abstract: | In 2015 June, the black hole X-ray binary (BHXRB) V404 Cygni went into outburst for the first time since 1989. Here, we present a comprehensive search for quasi-periodic oscillations (QPOs) of V404 Cygni during its recent outburst, utilizing data from six instruments on board five different X-ray missions: Swift/XRT, Fermi/GBM, Chandra/ACIS, INTEGRAL’s IBIS/ISGRI and JEM-X, and NuSTAR. We report the detection of a QPO at 18 mHz simultaneously with both Fermi/GBM and Swift/XRT, another example of a rare but slowly growing new class of mHz-QPOs in BHXRBs linked to sources with a high orbital inclination. Additionally, we find a duo of QPOs in a Chandra/ACIS observation at 73 mHz and 1.03 Hz, as well as a QPO at 136 mHz in a single Swift/XRT observation that can be interpreted as standard Type-C QPOs. Aside from the detected QPOs, there is significant structure in the broadband power, with a strong feature observable in the Chandra observations between 0.1 and 1 Hz. We discuss our results in the context of current models for QPO formation. | URI: | http://hdl.handle.net/20.500.12386/26621 | URL: | https://iopscience.iop.org/article/10.3847/1538-4357/834/1/90 | ISSN: | 0004-637X | DOI: | 10.3847/1538-4357/834/1/90 | Bibcode ADS: | 2017ApJ...834...90H | Fulltext: | open |
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