Anti-correlated Soft Lags in the Intermediate State of Black Hole Source GX 339-4

Abstract

We report the few hundred second anti-correlated soft lags between soft and hard energy bands in the source GX 339-4 using RXTE observations. In one observation, anti-correlated soft lags were observed using the ISGRI/INTEGRAL hard energy band and the PCA/RXTE soft energy band light curves. The lags were observed when the source was in hard and soft intermediate states, i.e., in a steep power-law state.We found that the temporal and spectral properties were changed during the lag timescale. The anti-correlated soft lags are associated with spectral variability during which the geometry of the accretion disk is changed. The observed temporal and spectral variations are explained using the framework of truncated disk geometry. We found that during the lag timescale, the centroid frequency of quasi-periodic oscillation is decreased, the soft flux is decreased along with an increase in the hard flux, and the power-law index steepens together with a decrease in the disk normalization parameter. We argue that these changes could be explained if we assume that the hot corona condenses and forms a disk in the inner region of the accretion disk. The overall spectral and temporal changes support the truncated geometry of the accretion disk in the steep power-law state or in the intermediate state.

arXiv commentpublished in ApJ, 9 pages, 8 figures

References in corpus (38)

• X-ray Properties of Black-Hole Binaries
• Towards a unified model for black hole X-ray binary jets
• Advection-Dominated Accretion and the Spectral States of Black Hole X-Ray Binaries: Application to Nova Muscae 1991
• Modelling the behaviour of accretion flows in X-ray binaries
• ISGRI: the INTEGRAL Soft Gamma-Ray Imager
• A universal radio/X-ray correlation in low/hard state black hole binaries
• First Results from the All-Sky Monitor on the Rossi X-ray Timing Explorer
• Calibration of the Rossi X-ray Timing Explorer Proportional Counter Array
• Relativistic X-ray Lines from the Inner Accretion Disks Around Black Holes
• The ABC of low-frequency quasi-periodic oscillations in Black-Hole Candidates: analogies with Z-sources
• Jets from black hole X-ray binaries: testing, refining and extending empirical models for the coupling to X-rays
• A Global Spectral Study of Black Hole X-ray Binaries
• GX 339-4: the distance, state transitions, hysteresis and spectral correlations
• Dynamical Evidence for a Black Hole in GX 339-4
• A study of the low-frequency quasi-periodic oscillations in the X-ray light curves of the black hole candidate XTE J1859+226
• Gamma-Ray Spectral States of Galactic Black Hole Candidates
• Correlation among QPO frequencies and Quiescence-state Duration in Black Hole Candidate GRS 1915+105
• The EXOSAT data on GX 339-4: further evidence for an ``intermediate'' state
• The Distance and Interstellar Sight Line to GX339-4
• The evolution of the high-energy cut-off in the X-Ray spectrum of the GX 339-4 across a hard-to-soft transition
• The 2003 Outburst of the X-ray Transient H 1743-322: Comparisons with the Black Hole Microquasar XTE J1550-564
• Spectral Index and Quasi-Periodic Oscillation Frequency Correlation in Black Hole (BH) Sources: Observational Evidence of Two Phases and Phase Transition in BHs
• An optically thick inner corona geometry for the Very High State Galactic Black Hole XTE J1550-564
• Observational Evidence for Strong Disk Comptonization in GRO J1655-40
• A transient large-scale relativistic radio jet from GX 339-4
• The Existence of Inner Cool Disks in the Low Hard State of Accreting Black Holes
• Variability of X-ray binaries from an oscillating hot corona
• Re-condensation from an ADAF into an inner disk - the intermediate state of black hole accretion?
• The energy dependence of the centroid frequency and phase lag of the QPOs in GRS 1915+105
• Optical Spectroscopy of GX339-4 during the High-Soft and Low-Hard States II: Line Ionisation and Emission Region
• Phase Lag and Coherence Function of X-ray emission from Black Hole Candidate XTE J1550-564
• Evolution of cross-correlation and time lag of Cyg X-2 along the branches
• Anti-correlated hard X-ray time lags in Galactic black hole sources
• Broad-band X-ray spectral evolution of GX 339-4 during a state transition
• INTEGRAL and XMM-Newton Spectroscopy of GX 339-4 During Hard/Soft Intermediate and High/Soft States in the 2007 Outburst
• Detection of anti-correlated hard X-ray time lag in Cygnus X-3
• Anti-correlated hard X-ray time lag in GRS 1915+105: evidence for a truncated accretion disc
• A truncated accretion disk in the galactic black hole source H1743-322

Cited by in corpus (10)

• Fast transition of type-B QPO in the black hole transient XTE J1817-330
• Anti-correlated time lags in the Z source GX 5-1: Possible evidence for a truncated accretion disk
• Evolution of cross-correlation and time lag of 4U 1735-44 along the branches
• Constraining the Coronal Heights and Readjustment Velocities Based on the Detection of a Few Hundred Seconds Delays in the Z Source GX 17+2
• Coupled HBO and NBO variations in the Z source GX 5-1: inner accretion disk as the location of QPOs
• The properties of cross-correlation and spectra of the low-mass X-ray binary 4U 1608-52
• Cross-correlations between soft and hard light curves depending on luminosity in the transient neutron star XTE J1701-462
• The cross-correlation analysis in Z source GX 349+2
• Investigating the coronal structure by studying time lags in the Atoll source 4U 1705-44 using AstroSat
• A study of the cross-correlation and time lag in black hole X-ray binary XTE J1859+226