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 Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Observational signatures of accretion disc winds have been found in asignificant number of low-mass X-ray binaries at either X-ray or opticalwavelengths. The 2015 outburst of the black hole transient V404 Cygni provideda unique opportunity for studying both types of outflows in the same system. Weused contemporaneous X-ray (Chandra Observatory) and optical (Gran TelescopioCanarias, GTC) spectroscopy, in addition to hard X-ray light curves (INTEGRAL).We show that the kinetic properties of the wind, as derived from P-Cyg profilesdetected in the optical range at low hard X-ray fluxes and in a number of X-raytransitions during luminous flares, are remarkably similar. Furthermore,strictly simultaneous data taken at intermediate hard X-ray fluxes showconsistent emission line properties between the optical and the X-ray emissionlines, which most likely arise in the same accretion disc wind. We discussseveral scenarios to explain the properties of the wind, favouring the presenceof a dynamic, multi-phase outflow during the entire outburst of the system.This study, together with the growing number of wind detections with fairlysimilar characteristic velocities at different wavelengths, suggest thatwind-type X-ray binary outflows might be predominantly multi-phase in nature.

Simultaneous X-ray and optical spectroscopy of V404 Cygni supports the multi-phase nature of X-ray binary accretion disc winds