The aperiodic broad-band X-ray variability of Cygnus X-3

Abstract

We study the soft X-ray variability of Cygnus X-3. By combining data from the All-Sky Monitor and Proportional Counter Array instruments on the RXTE satellite with EXOSAT Medium Energy (ME) detector observations, we are able to analyse the power density spectrum (PDS) of the source from 10^(-9) - 0.1 Hz, thus covering time-scales from seconds to years. As the data on the longer time-scales are unevenly sampled, we combine traditional power spectral techniques with simulations to analyse the variability in this range. The PDS at higher frequencies (>10^-3 Hz) are for the first time compared for all states of this source. We find that it is for all states well-described by a power-law, with index ~-2 in the soft states and a tendency for a less steep power-law in the hard state. At longer time-scales, we study the effect of the state transitions on the PDS, and find that the variability below ~10^(-7) Hz is dominated by the transitions. Furthermore, we find no correlation between the length of a high/soft state episode and the time since the previous high/soft state. On intermediate time-scales we find evidence for a break in the PDS at time-scales of the order of the orbital period. This may be interpreted as evidence for the existence of a tidal resonance in the accretion disc around the compact object, and constraining the mass ratio to M2/M1<0.3.

arXiv comment8 pages, 5 figures, accepted for publication in MNRAS

References in corpus (18)

• Modelling the behaviour of accretion flows in X-ray binaries
• Physical Properties of Wolf-Rayet Stars
• First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
• A Unified Description of the Timing Features of Accreting X-ray Binaries
• On IC 10 X-1, the Most Massive Known Stellar-Mass Black Hole
• Variability in black hole accretion discs
• The Orbital Period of the Wolf-Rayet Binary IC 10 X-1; Dynamic Evidence that the Compact Object is a Black Hole
• Power spectra of black holes and neutron stars as a probe of hydrodynamical structure of the source. Diffusion theory and its application to Cyg X-1 and Cyg X-2 X-ray observations
• Infrared spectroscopic variability of Cygnus X-3 in outburst and quiescence
• Effects of the stellar wind on X-ray spectra of Cygnus X-3
• The nature of the hard state of Cygnus X-3
• Spectral variability in Cygnus X-3
• A 33 hour period for the Wolf-Rayet/black hole X-ray binary candidate NGC 300 X-1
• A review of rapid X-ray variability in X-ray binaries
• Probing the temporal variability of Cygnus X-1 into the soft state
• A Wolf-Rayet/black-hole X-ray binary candidate in NGC 300
• Extended Emission from Cygnus X-3 Detected with Chandra
• Binary corrected X-ray light curve of Cygnus X-3 : implications for the timing properties of the compact binary system

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