Inclination effects on the X-ray emission of Galactic black-hole binaries

Abstract

Galactic black-hole X-ray binaries (BHBs) emit a compact, optically thick, mildly relativistic radio jet when they are in the hard and hard-intermediate states. In these states, BHBs exhibit a correlation between the time lag of hard photons with respect to softer ones and the photon index of the power law component that characterizes the X-ray spectral continuum above $\sim$ 10 keV. The correlation, however, shows large scatter. Our objective is to investigate the role that the inclination of the system plays on the correlation between the time lag and the photon index. We find that the correlation between the time lag and the photon index is tight in low-inclination systems and becomes weaker in high-inclination systems. The amplitude of the lags is also larger at low and intermediate inclination angles than at high inclination. Our jet model that reproduces the process of Comptonization in an extended jet can account for the observations remarkably well.

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• Time lags of the type-B QPO in MAXI J1348-630
• Dual-Corona Comptonization model for the Type-B Quasi-Periodic Oscillations in GX 339-4
• A quantitative explanation of the type-B QPOs in GX 339-4
• Conflicting disk inclination estimates for the black hole X-ray binary XTE J1550-564
• Illumination of the accretion disk in black hole binaries: An extended jet as the primary source of hard X-rays
• Spectro-temporal studies of rapid transition of the quasi periodic oscillations in the black hole source H1743-322
• Time-domain variability properties of XTE J1650-500 during its 2001 outburst: Evidence of disc-jet connection
• Evidence of Outflow Induced Soft Lags of Galactic Black Holes
• The X-ray corona in the black-hole binary GRO J1655--40 from the properties of non-harmonically related quasi-periodic oscillations
• Spectral and Timing evolution of GX 340+0 along its Z-track
• A quantitative explanation of the radio--X-ray correlation in black-hole X-ray binaries
• Probing black-hole accretion through time variability
• The role of outflows in black-hole X-ray binaries