The nova-like nebular optical spectrum of V404 Cygni at the beginning of the 2015 outburst decay

F. Rahoui, J. A. Tomsick, P. Gandhi +7

We report on FORS2 optical spectroscopy of the black hole X-ray binary V404 Cygni, performed at the very beginning of its 2015 outburst decay, complemented by quasi-simultaneous $S…