Variable-Frequency QPOs from the Galactic Microquasar GRS 1915+105

Abstract

We show that the galactic microquasar GRS 1915+105 exhibits quasi-periodic oscillations (QPOs) whose frequency varies continuously from 1-15 Hz, during spectrally hard dips when the source is in a flaring state. We report here analyses of simultaneous energy spectra and power density spectra at 4 s intervals. The energy spectrum is well fit at each time step by an optically thick accretion disk plus power law model, while the power density spectrum consists of a varying red noise component plus the variable frequency QPO. The features of both spectra are strongly correlated with one another. The 1-15 Hz QPOs appear when the power law component becomes hard and intense, and themselves have an energy spectrum consistent with the power law component (with root mean square amplitudes as high as 10%). The frequency of the oscillations, however, is most strikingly correlated with the parameters of the thermal disk component. The tightest correlation is between QPO frequency and the disk X-ray flux. This fact indicates that the properties of the QPO are not determined by solely a disk or solely a corona.

Accepted to ApJ Letters, 12 pages, 3 figures, AASTEX format

References in corpus (8)

• Black Hole Spin in X-Ray Binaries: Observational Consequences
• A unified model for the spectral variability in GRS 1915+105
• Evidence for Frame-Dragging Around Spinning Black Holes in X-Ray Binaries
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Cited by in corpus (72)

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• Characterizing the QPO Behavior of the X-ray Nova XTE J1550--564
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• The faint "heartbeats" of IGR J17091-3624: an exceptional black-hole candidate
• Discovery of a Second High Frequency QPO from the Microquasar GRS 1915+105
• The Physics of the 'Heartbeat' State of GRS 1915+105
• The 2003 Outburst of the X-ray Transient H 1743-322: Comparisons with the Black Hole Microquasar XTE J1550-564
• Tracing the power-law component in the energy spectrum of black hole candidates as a function of the QPO frequency
• Spectral Index and Quasi-Periodic Oscillation Frequency Correlation in Black Hole (BH) Sources: Observational Evidence of Two Phases and Phase Transition in BHs
• Correlations between Low-Frequency QPOs and Spectral Parameters in XTE J1550-564 and GRO J1655-40
• Super-Eddington outburst of V4641 Sgr
• Fast variability from black-hole binaries
• Two Years of INTEGRAL monitoring of GRS 1915+105 Part 2: X-Ray Spectro-Temporal Analysis
• Variable Iron K-alpha Lines in Seyfert 1 Galaxies
• Evidence for a relativistic iron line in GRS 1915+105
• The energy dependence of the centroid frequency and phase lag of the QPOs in GRS 1915+105
• Accretion-ejection instability and QPO in black hole binaries. I. Observations
• Spectral Properties of Low Quasi-Periodic Oscillations in GRS 1915+105
• The High-Frequency QPOs in GRS 1915+105
• Radio Emission and the Timing Properties of the Hard X-ray State of GRS 1915+105
• Simultaneous multi-wavelength observations of GRS 1915+105
• High-frequency Quasi-Periodic Oscillations from GRS 1915+105 in its C state
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• A Comptonization Model for Phase Lag Variability in GRS 1915+105
• A transient low-frequency QPO from the black hole binary GRS 1915+105
• The X-ray Properties of Low-Frequency Quasi-Periodic Oscillations from GRS 1915+105 up to 120 keV
• A variable corona for GRS 1915+105
• Shocks in the relativistic transonic accretion with low angular momentum
• An X-ray Timing Study of XTE J1550--564: Evolution of the Low Frequency QPO for the Complete 2000 Outburst
• Accretion-ejection instability and QPO in black-hole binaries.II. Relativistic effects
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• The evolving properties of the corona of GRS 1915+105: A spectral-timing perspective through variable-Comptonisation modelling
• High-Frequency Quasi-Periodic Oscillations from GRS 1915+105
• Energy Dependence of a Low Frequency QPO in GRS 1915+105
• A new model for QPOs in accreting black holes: application to the microquasar GRS 1915+105
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• Rapid State Transitions in the Galactic Black Hole Candidate Source GRS 1915+105
• Observational evidence for mass ejection during soft X-ray dips in GRS1915+105
• Does GRS 1915+105 exhibit "canonical" black-hole states?
• Low-frequency oscillations in XTE J1550-564
• M74 X-1 (CXOU J013651.1+154547): An Extremely Variable Ultraluminous X-Ray Source
• A Statistical Study on the Low-Frequency QPO Amplitude Spectrum and Amplitude in GRS 1915+105
• Effects of adiabatic index on the sonic surface and time variability of low angular momentum accretion flows
• An Atlas of Exotic Variability in IGR J17091-3624: A Comparison with GRS 1915+105
• Accretion Disc Wind Variability in the States of the Microquasar GRS 1915+105
• Anti-correlated hard X-ray time lags in Galactic black hole sources
• Detection of a Series of X-ray Dips Associated with a Radio Flare in GRS 1915+105
• Evidence for local mass accretion rate variations in the disc of GRS 1915+105
• X-ray Spectral and timing properties of the black hole x-ray transient Swift J1753.5-0127
• Are Low-Frequency Quasi-Periodic Oscillations seen in accretion flows the disk response to a jet instability?
• Black-Hole Transients : From QPOs to Relativistic Jets
• Millihertz quasi-periodic oscillations and broad iron line from LMC X-1
• A Systematic Study on Energy Dependence of Quasi-Periodic Oscillation Frequency in GRS 1915+105
• Discovery of a new INTEGRAL source: IGR J19140+0951
• A search for very high-energy flares from the microquasars GRS 1915+105, Circinus X-1, and V4641 Sgr using contemporaneous H.E.S.S. and RXTE observations
• Study of relativistic accretion flow around KTN black hole with shocks
• Low Frequency Coherence Break in The Soft X-ray State of GRS 1915+105
• Evolution of Accretion Disc Geometry of GRS~1915+105 during its $\chi$ state as revealed by TCAF solution
• Accretion Flow Properties of GRS 1915+105 During Its $\theta$ Class Using AstroSat Data
• Detection of distinct power spectra in soft and hard X-ray bands in the hard state of GRS 1915+105
• Does Low Frequency X-ray QPO Behavior in GRS 1915+105 Influence Subsequent X-ray and Infrared Evolution?
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• A non-linear mathematical model for the X-ray variability of the microquasar GRS 1515+105 -- III: Low-frequency Quasi Periodic Oscillations
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• Inner Disk Oscillations and QPOs in Relativistic Jet Sources