Towards a unified model for black hole X-ray binary jets

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ID: 303443
2004
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Abstract
We present a unified semi-quantitative model for the disc-jet coupling in black hole X-ray binary systems. We argue that during the rising phase of a black hole transient outburst the steady jet known to be associated with the canonical 'low/hard' state persists while the X-ray spectrum initially softens. Subsequently, the jet becomes unstable and an optically thin radio outburst is always associated with the soft X-ray peak at the end of this phase of softening. This peak corresponds to a 'soft very high state' or 'steep power law' state. Softer X-ray states are not associated with 'core' radio emission. We further demonstrate quantitatively that the transient jets associated with these optically thin events are considerably more relativistic than those in the 'low/hard' X-ray state. This in turn implies that as the disc makes its collapse inwards the jet Lorentz factor rapidly increases, resulting in an internal shock in the outflow, which is the cause of the observed optically thin radio emission. In addition, we estimate the jet power for a number of such transient events as a function of X-ray luminosity, and find them to be comparable to an extrapolation of the functions estimated for the 'low/hard' state jets. Finally, we attempt to fit these results together into a coherent semi-quantitative model for the disc-jet coupling in all black hole X-ray binary systems (abridged).
Reference Key
openalex_W3099401213 Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors R. P. Fender, T. Belloni, Elena Gallo
Journal monthly notices of the royal astronomical society
Year 2004
DOI
10.1111/j.1365-2966.2004.08384.x
URL
https://academic.oup.com/mnras/article-pdf/355/4/1105/6271740/355-4-1105.pdf
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