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Multi-Wavelength Variability

Accretion and Ejection at the Fastest Timescales

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Abstract

Multiwavelength variability data, combined with spectral-timing analysis techniques, provides information about the causal relationship between different physical components in accreting black holes. Using fast-timing data and long-term monitoring, we can probe the behaviour of the same components across the black hole mass scale. In this chapter we review the observational status of multiwavelength variability in accreting black holes, from black hole X-ray binaries to AGN, and consider the implications for models of accretion and ejection, primarily considering the evidence for accretion disc and jet variability in these systems. We end with a consideration of future prospects in this quickly-developing field.

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Notes

  1. Other AGNs show power spectra consistent with singly-broken or bending power-laws, similar to those seen in BHXRB soft states, e.g. McHardy et al. (2004).

  2. Note that significant X-ray beaming towards the disc can be ruled out by the observed X-ray reflection component which is not stronger than expected, in most cases.

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  1. Anton Pannekoek Institute, University of Amsterdam, Science Park 904, 1098, XH, Amsterdam, The Netherlands

    Phil Uttley

  2. Osservatorio Astronomico di Roma, INAF, Via Frascati 33, 00040, Monteporzio Catone, Italy

    Piergiorgio Casella

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Uttley, P., Casella, P. Multi-Wavelength Variability. Space Sci Rev 183, 453–476 (2014). https://doi.org/10.1007/s11214-014-0072-4

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