Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
After more than 26 years in quiescence, the black hole transient V404 Cyg went into a luminous outburst in June 2015, and additional activity was detected in late December of the same year. Here, we present an optical spectroscopic follow-up of the December mini-outburst, together with X-ray, optical and radio …