DETECTION of VERY LOW-FREQUENCY, QUASI-PERIODIC OSCILLATIONS in the 2015 OUTBURST of V404 CYGNI

D. Huppenkothen, G. Younes, A. Ingram, C. Kouveliotou, S. E. Gogu, M. Bachetti, C. Sánchez-Fernández, J. Chenevez, S. Motta, M. Van Der Klis, J. Granot, N. Gehrels, E. Kuulkers, J. A. Tomsick, D. J. Walton

Research output: Contribution to journalArticlepeer-review

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.

Original languageEnglish
Article number90
JournalAstrophysical Journal
Volume834
Issue number1
DOIs
StatePublished - 1 Jan 2017

Keywords

  • X-rays: binaries
  • methods: statistical
  • relativistic processes
  • stars: black holes

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

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