The December 2015 re-brightening of V404 Cyg: Variable absorption from the accretion disc outflow

Understand

In December 2015 the black hole binary V404 Cyg underwent a secondary outburst after the main June 2015 event.

• We monitored this re-brightening with the INTEGRAL and Swift satellites, and in this paper we report the results of the time-resolved spectral analysis of these data.
• The December outburst shared similar characteristics with the June one.
• The well sampled INTEGRAL light curve shows up to 10 Crab flares, which are separated by relatively weak non-flaring emission phases when compared to the June outburst.