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    Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni

    241236_241236.pdf (2.482Mb)
    Access Status
    Open access
    Authors
    Rodriguez, J.
    Cadolle Bel, M.
    Alfonso-Garzón, J.
    Siegert, T.
    Zhang, X.
    Grinberg, V.
    Savchenko, V.
    Tomsick, J.
    Chenevez, J.
    Clavel, M.
    Corbel, S.
    Diehl, R.
    Domingo, A.
    Gouiffès, C.
    Greiner, J.
    Krause, M.
    Laurent, P.
    Loh, A.
    Markoff, S.
    Mas-Hesse, J.
    Miller-Jones, James
    Russell, D.
    Wilms, J.
    Date
    2015
    Type
    Journal Article
    
    Metadata
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    Citation
    Rodriguez, J. and Cadolle Bel, M. and Alfonso-Garzón, J. and Siegert, T. and Zhang, X. and Grinberg, V. and Savchenko, V. et al. 2015. Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni. Astronomy and Astrophysics. 581: Article No 9.
    Source Title
    Astronomy and Astrophysics
    DOI
    10.1051/0004-6361/201527043
    ISSN
    0004-6361
    School
    Department of Physics and Astronomy
    Remarks

    Reproduced with permission from Astronomy & Astrophysics, © ESO

    URI
    http://hdl.handle.net/20.500.11937/33365
    Collection
    • Curtin Research Publications
    Abstract

    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 20, 15:50 UTC to June 25, 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 exceeding 6 Crab (20–40 keV) within three days. The flare recurrence can be as short as ~20 min from peak to peak. A model-independent analysis shows that the >6 Crab flares have a hard spectrum. A simple 10–400 keV spectral analysis of the off-flare and flare periods shows that the variation in intensity is likely to be only due to variations of a cut-off power-law component. The optical flares seem to be at least of two different types: one occurring in simultaneity with the X-ray flares, the other showing a delay greater than 10 min. The former could be associated with X-ray reprocessing by either an accretion disk or the companion star. We suggest that the latter are associated with plasma ejections that have also been seen in radio.

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