Transient Black Hole Binaries
T. M. Belloni, S. E. Motta

TL;DR
This paper reviews two decades of research on transient black-hole binaries, emphasizing the importance of outflows and spectral-timing states in understanding their complex accretion and ejection phenomena across multiple wavelengths.
Contribution
It provides a comprehensive review of observational and theoretical advances in understanding the accretion-ejection connection in black-hole transients, integrating multi-wavelength phenomenology.
Findings
Spectral-timing states are crucial for understanding outburst evolution.
Outflows play a fundamental role alongside accretion in transient behavior.
The review highlights the importance of multi-wavelength observations in studying black-hole binaries.
Abstract
The last two decades have seen a great improvement in our understand- ing of the complex phenomenology observed in transient black-hole binary systems, especially thanks to the activity of the Rossi X-Ray Timing Explorer satellite, com- plemented by observations from many other X-ray observatories and ground-based radio, optical and infrared facilities. Accretion alone cannot describe accurately the intricate behavior associated with black-hole transients and it is now clear that the role played by different kinds of (often massive) outflows seen at different phases of the outburst evolution of these systems is as fundamental as the one played by the accretion process itself. The spectral-timing states originally identified in the X-rays and fundamentally based on the observed effect of accretion, have acquired new importance as they now allow to describe within a coherent picture the…
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