http://arxiv.org/abs/1911.06332
We present results from the first multi-epoch X-ray/IR fast-photometry campaign on the black-hole transient GX 339–4, during its 2015 outburst decay. We studied the evolution of the power spectral densities finding strong differences between the two bands. The X-ray power spectral density follows standard patterns of evolution, plausibly reflecting changes in the accretion flow. The IR power spectral density instead evolves very slowly, with a high-frequency break consistent with remaining constant at $0.63 \pm 0.03$ Hz throughout the campaign. We discuss this result in the context of the currently available models for the IR emission in black-hole transients. While all models will need to be tested quantitatively against this unexpected constraint, we show that an IR emitting relativistic jet which filters out the short-timescales fluctuations injected from the accretion inflow appears as the most plausible scenario.
F. Vincentelli, P. Casella, P. Petrucci, et. al.
Mon, 18 Nov 19
26/48
Comments: Accepted for publication in ApJ Letter. 9 pages, 3 figures
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