Correlated optical, X-ray, and $-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni
- Rodriguez, J.
- Cadolle Bel, M.
- Alfonso-Garzón, J.
- Siegert, T.
- Zhang, X.-L.
- Grinberg, V.
- Savchenko, V.
- Tomsick, J.~A.
- Chenevez, J.
- Clavel, M.
- Corbel, S.
- Diehl, R.
- Domingo, A.
- Gouiffès, C.
- Greiner, J.
- Krause, M.~G.~H.
- Laurent, P.
- Loh, A.
- Markoff, S.
- Mas-Hesse, J.~M.
- Miller-Jones, J.~C.~A.
- Russell, D.~M.
- Wilms, J.
DOIAbstract
Reproduced with permission from Astronomy & Astrophysics. © 2015 ESO.After 25 years of quiescence, the microquasar V404 Cyg entered a new period of activity in June 2015. This X-ray source is known to undergo extremely bright and variable outbursts seen at all wavelengths. It is therefore an object of prime interest to understand the accretion-ejection connections. These can, however, only be probed through simultaneous observations at several wavelengths. We made use of the INTEGRAL instruments to obtain long, almost uninterrupted observations from 2015 June 20th, 15:50 UTC to June 25th, 4:05 UTC, from the optical V-band, up to the soft γ-rays. V404 Cyg was extremely variable in all bands, with the detection of 18 flares with fluxes exceed...
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