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

J. Rodriguez, M. Cadolle Bel, J. Alfonso-Garzón, T. Siegert, X. L. Zhang, V. Grinberg, V. Savchenko, J. A. Tomsick, J. Chenevez, M. Clavel, S. Corbel, R. Diehl, A. Domingo, C. Gouiffès, J. Greiner, M. G.H. Krause, P. Laurent, A. Loh, S. Markoff, J. M. Mas-HesseJ. C.A. Miller-Jones, Dave Russell, J. Wilms

Research output: Contribution to journalArticle

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.

Original languageEnglish (US)
Article numberL9
JournalAstronomy and Astrophysics
Volume581
DOIs
StatePublished - Sep 1 2015

Fingerprint

outburst
flares
rays
crab
accretion
wavelength
x rays
crabs
spectral analysis
ejection
power law
radio
plasma
companion stars
extremely high frequencies
flaring
wavelengths
accretion disks
spectrum analysis
cut-off

Keywords

  • Accretion, accretion disks
  • Radio continuum: stars
  • Stars: black holes
  • Stars: individual: V404 Cygni
  • X-rays: binaries

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Rodriguez, J., Cadolle Bel, M., Alfonso-Garzón, J., Siegert, T., Zhang, X. L., Grinberg, V., ... Wilms, J. (2015). Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni. Astronomy and Astrophysics, 581, [L9]. https://doi.org/10.1051/0004-6361/201527043

Correlated optical, X-ray, and γ-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, Dave; Wilms, J.

In: Astronomy and Astrophysics, Vol. 581, L9, 01.09.2015.

Research output: Contribution to journalArticle

Rodriguez, J, Cadolle Bel, M, Alfonso-Garzón, J, Siegert, T, Zhang, XL, Grinberg, V, Savchenko, V, Tomsick, JA, Chenevez, J, Clavel, M, Corbel, S, Diehl, R, Domingo, A, Gouiffès, C, Greiner, J, Krause, MGH, Laurent, P, Loh, A, Markoff, S, Mas-Hesse, JM, Miller-Jones, JCA, Russell, D & Wilms, J 2015, 'Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni', Astronomy and Astrophysics, vol. 581, L9. https://doi.org/10.1051/0004-6361/201527043
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, Dave ; Wilms, J. / Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni. In: Astronomy and Astrophysics. 2015 ; Vol. 581.
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AU - Rodriguez, J.

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AU - Alfonso-Garzón, J.

AU - Siegert, T.

AU - Zhang, X. L.

AU - Grinberg, V.

AU - Savchenko, V.

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AU - Laurent, P.

AU - Loh, A.

AU - Markoff, S.

AU - Mas-Hesse, J. M.

AU - Miller-Jones, J. C.A.

AU - Russell, Dave

AU - Wilms, J.

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KW - X-rays: binaries

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