Anti-correlated hard X-ray time lag in GRS 1915+105: evidence for a truncated accretion disc

Abstract

Multi-wavelength observations of Galactic black hole candidate sources indicate a close connection between the accretion disk emission and the jet emission. The recent discovery of an anti-correlated time lag between the soft and hard X-rays in Cygnus X-3 (Choudhury & Rao 2004) constrains the geometric picture of the disk-jet connection into a truncated accretion disk, the truncation radius being quite close to the black hole. Here we report the detection of similar anti-correlated time lag in the superluminal jet source GRS 1915+105. We show the existence of the pivoting in the X-ray spectrum during the delayed anti-correlation and we also find that the QPO parameters change along with the spectral pivoting. We explore theoretical models to understand this phenomenon.

arXiv commentAccepted in ApJ: (to appear on 1 Oct, 2005 issue)

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• Anti-correlated hard X-ray time lags in Galactic black hole sources
• 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
• Anti-correlated Soft Lags in the Intermediate State of Black Hole Source GX 339-4
• A truncated accretion disk in the galactic black hole source H1743-322
• 2016 outburst of H~1743--322: \textit{XMM-Newton} and \textit{NuSTAR} view
• 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
• A Detection of an Anti-correlated Hard X-ray Lag in AM Herculis
• A study of the cross-correlation and time lag in black hole X-ray binary XTE J1859+226
• Investigating the coronal structure by studying time lags in the Atoll source 4U 1705-44 using AstroSat