Timing Analysis of V404 Cyg during Its Brightest Outburst with INTEGRAL/SPI
arXiv:1709.01312 · doi:10.3847/1538-4357/aa89ea
Abstract
The outburst of V404 Cyg during the summer of 2015 reached unparalleled intensities at X-ray and soft gamma-ray energies with fluxes \( > 50\) Crab in the \(20-50\) keV energy band. To date, studies in the hard X-ray/soft gamma-ray energy domain have focused primarily on the energy spectra. In this work, timing analysis has been performed with \textit{INTEGRAL}/SPI data in the \(20-300\) keV energy range for \textit{INTEGRAL} revolution 1557, which corresponds to the brightest flare of V404 Cyg (on June, 26). The power spectra are fit with broken power-law and multi-Lorentzian models and compared with previously reported results of V404 Cyg flaring activity from 1989 and 2015. Also, we took advantage of the good signal-to-noise ratio obtained above 70 keV to quantify the timing/fast-variability properties of the source as a function of energy. We then point out similarities of V404 Cyg with the black hole transient V4641 Sgr. Like V4641 Sgr, we found the power spectra of V404 Cyg during high flux periods did not possess the expected flat-top feature typically seen in a hard spectral state. Interpretations are proposed in the framework of the fluctuating-propagation model to explain the observed properties.
arXiv comment12 pages, 5 figures, Accepted in ApJ
References in corpus (30)
- Modelling the behaviour of accretion flows in X-ray binaries
- Going with the flow: can the base of jets subsume the role of compact accretion disk coronae?
- The May 1989 outburst of the Soft X-ray Transient GS 2023+338 (V404 Cyg)
- A Unified Description of the Timing Features of Accreting X-ray Binaries
- Non-linear X-ray variability in X-ray binaries and active galaxies
- Investigating a Fluctuating-accretion Model for the Spectral-timing Properties of Accreting Black Hole Systems
- On the X-ray time lags in the black hole candidates
- Soft state of Cygnus X-1: stable disk and unstable corona
- The Galaxy UV Luminosity Function Before the Epoch of Reionization
- A physical model for the continuum variability and QPO in accreting black holes
- SPI/INTEGRAL in-flight performance
- X-ray emission from black-hole binaries
- An exact analytic treatment of propagating mass accretion rate fluctuations in X-ray binaries
- Modelling variability in black hole binaries: linking simulations to observations
- Super-Eddington outburst of V4641 Sgr
- Repetitive Patterns in Rapid Optical Variations in the Nearby Black-hole Binary V404 Cygni
- Energy and time-lag spectra of black-hole systems in the low state
- The black hole binary V404 Cygni: an obscured AGN analogue
- Spectra and time variability of galactic black-hole X-ray sources in the low/hard state
- The rapid X-ray variability of V4641 Sagittarii (SAX J1819.3-2525 = XTE J1819-254)
- SWIFT view of the 2015 outburst of GS 2023+338 (V404 Cyg): complex evolution of spectral and temporal characteristics
- First INTEGRAL observations of V404 Cygni during the 2015 outburst : spectral behavior in the 20 - 650 keV energy range
- Hard X-ray Lags in Cygnus X-1
- X-ray spectral evolution of V404 Cygni in the initial phase of the 2015 outburst
- GBM Observations of V404 Cyg During its 2015 Outburst
- Spectral and Timing Studies of Cyg X-1 in the Low/Hard State with Suzaku
- Detection of Very Low-Frequency Quasi-Periodic Oscillations in the 2015 Outburst of V404 Cygni
- A challenging view of the 2015 summer V404 Cyg outburst at high energy with INTEGRAL/SPI: The finale
- Timing Noise Properties of GRO J0422+32
- Fast Timing Analysis of Cygnus X-1 using SPI on board INTEGRAL