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Regulation of black-hole accretion by a disk wind during a violent outburst of V404 Cygni

Ponti, G.; Charles, P. A.; Rodriguez, J. +7 more

Accretion of matter onto black holes is universally associated with strong radiative feedback and powerful outflows. In particular, black-hole transients have outflows whose properties are strongly coupled to those of the accretion flow. This includes X-ray winds of ionized material, expelled from the accretion disk encircling the black hole, and …

Positron annihilation signatures associated with the outburst of the microquasar V404 Cygni

Beloborodov, Andrei M.; Diehl, Roland; Greiner, Jochen +7 more

Microquasars are stellar-mass black holes accreting matter from a companion star and ejecting plasma jets at almost the speed of light. They are analogues of quasars that contain supermassive black holes of 10⁶ to 10¹⁰ solar masses. Accretion in microquasars varies on much shorter timescales than in quasars and occasionally p…

Repetitive patterns in rapid optical variations in the nearby black-hole binary V404 Cygni

Ruiz, Javier; Enoto, Teruaki; Nogami, Daisaku +65 more

How black holes accrete surrounding matter is a fundamental yet unsolved question in astrophysics. It is generally believed that matter is absorbed into black holes via accretion disks, the state of which depends primarily on the mass-accretion rate. When this rate approaches the critical rate (the Eddington limit), thermal instability is supposed…