Ceccobello, C.

Connors, R.M.T.

Crumley, P.

Grinberg, V.

Heil, L.

Kantzas, D.

Lucchini, M.

Markoff, S.

van Eijnatten, D.

English

GX 339–4 is a black hole X-ray binary that is a key focus of accretion studies, since it goes into outburst roughly every 2–3 yr. Tracking of its radio, infrared (IR), and X-ray flux during multiple outbursts reveals tight broad-band correlations. The radio emission originates in a compact, self-absorbed jet; however, the origin of the X-ray emission is still debated: jet base or corona? We fit 20 quasi-simultaneous radio, IR, optical, and X-ray observations of GX 339–4 covering three separate outbursts in 2005, 2007, 2010–2011, with a composite corona+jet model, where inverse Compton emission from both regions contributes to the X-ray emission. Using a recently proposed identifier of the X-ray variability properties known as power-spectral hue, we attempt to explain both the spectral and evolving timing characteristics, with the model. We find the X-ray spectra are best fit by inverse Compton scattering in a dominant hot corona (kTe ∼ hundreds of keV). However, radio and IR-optical constraints imply a non-negligible contribution from inverse Compton scattering off hotter electrons (kTe ≥ 511 keV) in the base of the jets, ranging from a few up to ∼50 per cent of the integrated 3–100 keV flux. We also find that the physical properties of the jet show interesting correlations with the shape of the broad-band X-ray variability of the source, posing intriguing suggestions for the connection between the jet and corona

International Migration, Integration and Social Cohesion online publications

Combining timing characteristics with physical broad-band spectral modelling of black hole X-ray binary GX 339-4

https://pure.uva.nl/ws/files/46243060/Combining_timing_characteristics_with_physical_broad_band_spectral_modelling.pdf

Combining timing characteristics with physical broad-band spectral modelling of black hole X-ray binary GX 339-4

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International Migration, Integration and Social Cohesion online publications