English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We present results from the first multi-epoch X-ray/IR fast-photometrycampaign on the black-hole transient GX 339--4, during its 2015 outburst decay.We studied the evolution of the power spectral densities finding strongdifferences between the two bands. The X-ray power spectral density followsstandard patterns of evolution, plausibly reflecting changes in the accretionflow. The IR power spectral density instead evolves very slowly, with ahigh-frequency break consistent with remaining constant at $0.63 \pm 0.03$ Hzthroughout the campaign. We discuss this result in the context of the currentlyavailable models for the IR emission in black-hole transients. While all modelswill need to be tested quantitatively against this unexpected constraint, weshow that an IR emitting relativistic jet which filters out theshort-timescales fluctuations injected from the accretion inflow appears as themost plausible scenario.

Physical constraints from near-infrared fast photometry of the black-hole transient GX 339-4