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Probing Black-Hole Accretion Through Time Variability

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Handbook of X-ray and Gamma-ray Astrophysics

Abstract

Flux variability is a remarkable property of black hole (BH) accreting systems and a powerful tool to investigate the multi-scale structure of the accretion flow. The X-ray band is where some of the most rapid variations occur, pointing to an origin in the innermost regions close to the BH. The study of fast time variability provides us with means to explore the accretion flow around compact objects in ways which are inaccessible via spectral analysis alone and to peek at regions which cannot be imaged with the currently available instrumentation. In this chapter we will discuss fast X-ray variability in stellar-mass BH systems, namely, binary systems containing a star and a BH, occasionally contrasting it with observations of supermassive BHs in active galactic nuclei. We will explore how rapid variations of the X-ray flux have been used in multiple studies as a diagnostic of the innermost regions of the accretion flow in these systems. To this aim we will provide an overview of the currently most used analysis approaches for the study of X-ray variability, describe observations of both aperiodic and quasi-periodic phenomena, and discuss some of the proposed models.

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Authors and Affiliations

  1. Departament de Fìsica, EEBE, Universitat Politècnica de Catalunya, Barcelona, Spain

    Barbara De Marco

  2. INAF – Osservatorio Astronomico di Brera, Merate, Italy

    Sara E. Motta & Tomaso M. Belloni

Authors
  1. Barbara De Marco
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  2. Sara E. Motta
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  3. Tomaso M. Belloni
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Correspondence to Barbara De Marco .

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Editors and Affiliations

  1. Department of Physics, Fudan University, Shanghai, China

    Cosimo Bambi

  2. Inst. for Astronomy & Astrophysics, University of Tuebingen, Tuebingen, Baden-Württemberg, Germany

    Andrea Santangelo

Section Editor information

  1. Department of Physics, Fudan University, Shanghai, China

    Cosimo Bambi

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De Marco, B., Motta, S.E., Belloni, T.M. (2023). Probing Black-Hole Accretion Through Time Variability. In: Bambi, C., Santangelo, A. (eds) Handbook of X-ray and Gamma-ray Astrophysics. Springer, Singapore. https://doi.org/10.1007/978-981-16-4544-0_129-1

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  • DOI: https://doi.org/10.1007/978-981-16-4544-0_129-1

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