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 analysis of fast variability of Very Large Telescope/ISAAC(infra-red), \textit{XMM-Newton}/OM (optical) and EPIC-pn (X-ray), and RXTE/PCA(X-ray) observations of the black hole X-ray binary GX 339-4 in a rising hardstate of its outburst in 2010. We report the first detection of a QuasiPeriodic Oscillation (QPO) in the infra-red band (IR) of a black hole X-raybinary. The QPO is detected at 0.08 Hz in the IR as well as two optical bands(U and V). Interestingly, these QPOs are at half the X-ray QPO frequency at0.16 Hz, which is classified as the type-C QPO; a weak sub-harmonic close tothe IR and optical QPO frequency is also detected in X-rays. The broad bandsub-second time scale variability is strongly correlated in IR/X-ray bands,with X-rays leading the IR by over 100 ms. This short time delay, shape of thecross correlation function and spectral energy distribution strongly indicatethat this broad band variable IR emission is the synchrotron emission from thejet. A jet origin for the IR QPO is strongly favoured, but cannot bedefinitively established with the current data. The spectral energydistribution indicates a thermal disc origin for the bulk of the opticalemission, but the origin of the optical QPO is unclear. We discuss our findingsin the context of the existing models proposed to explain the origin ofvariability.

Detection of the first infra-red quasi periodic oscillation in a black hole X-ray binary