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Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni

Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
After more than 26 years in quiescence, the black hole transient V404 Cyg went into a luminous outburst in June 2015, and additional activity was detected in late December of the same year. Here, we present an optical spectroscopic follow-up of the December mini-outburst, together with X-ray, optical and radio monitoring that spanned more than a month. Strong flares with gradually increasing intensity are detected in the three spectral ranges during the ∼ 10 days following the Swift trigger. Our optical spectra reveal the presence of a fast outflowing wind, as implied by the detection of a P-Cyg profile (He i–5876 ˚A) with a terminal velocity of ∼ 2500 kms−1 . Nebularlike spectra – with an H α equivalent width of ∼ 500 ˚A – are also observed. All these features are similar to those seen during the main June 2015 outburst. Thus, the fast optical wind simultaneous with the radio jet is most likely present in every V404 Cyg outburst. Finally, we report on the detection of a strong radio flare in late January 2016, when X-ray and optical monitoring had stopped due to Sun constraints.
1745-3925
1-6
Munoz-Darias, T.
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Casares, J.
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Mata Sanchez, D.
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Fender, R.P.
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Armas Padila, M.
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Mooley, K.
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Hardy, L.
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Ponti, G.
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Dhillon, V.S.
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Jimenez-Ibarra, F.
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Butterley, T.
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Hickish, J.
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Littlefair, S.P.
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Perrott, Y.C.
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Casares, J.
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Mata Sanchez, D.
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Fender, R.P.
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Armas Padila, M.
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Mooley, K.
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Hardy, L.
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Charles, P.A.
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Ponti, G.
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Motta, S.E.
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Dhillon, V.S.
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Gandhi, P.
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Jimenez-Ibarra, F.
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Butterley, T.
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Carey, S.
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Grainge, K.J.B.
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Hickish, J.
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Littlefair, S.P.
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Perrott, Y.C.
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Razavi-Ghods, N.
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Rumsey, C.
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Scaife, A.M.M.
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Scott, P.F.
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Titterington, D.J.
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Wilson, R.W.
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Munoz-Darias, T., Casares, J., Mata Sanchez, D., Fender, R.P., Armas Padila, M., Mooley, K., Hardy, L., Charles, P.A., Ponti, G., Motta, S.E., Dhillon, V.S., Gandhi, P., Jimenez-Ibarra, F., Butterley, T., Carey, S., Grainge, K.J.B., Hickish, J., Littlefair, S.P., Perrott, Y.C., Razavi-Ghods, N., Rumsey, C., Scaife, A.M.M., Scott, P.F., Titterington, D.J. and Wilson, R.W. (2016) Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni. Monthly Notices of the Royal Astronomical Society: Letters, 1-6. (In Press)

Record type: Article

Abstract

After more than 26 years in quiescence, the black hole transient V404 Cyg went into a luminous outburst in June 2015, and additional activity was detected in late December of the same year. Here, we present an optical spectroscopic follow-up of the December mini-outburst, together with X-ray, optical and radio monitoring that spanned more than a month. Strong flares with gradually increasing intensity are detected in the three spectral ranges during the ∼ 10 days following the Swift trigger. Our optical spectra reveal the presence of a fast outflowing wind, as implied by the detection of a P-Cyg profile (He i–5876 ˚A) with a terminal velocity of ∼ 2500 kms−1 . Nebularlike spectra – with an H α equivalent width of ∼ 500 ˚A – are also observed. All these features are similar to those seen during the main June 2015 outburst. Thus, the fast optical wind simultaneous with the radio jet is most likely present in every V404 Cyg outburst. Finally, we report on the detection of a strong radio flare in late January 2016, when X-ray and optical monitoring had stopped due to Sun constraints.

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Accepted/In Press date: 21 October 2016
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 403001
URI: http://eprints.soton.ac.uk/id/eprint/403001
ISSN: 1745-3925
PURE UUID: 33e6bcf1-1ebe-407a-aa7f-55bf9cba4a1e
ORCID for P. Gandhi: ORCID iD orcid.org/0000-0003-3105-2615

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Date deposited: 21 Nov 2016 15:34
Last modified: 06 Jun 2018 12:21

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Contributors

Author: T. Munoz-Darias
Author: J. Casares
Author: D. Mata Sanchez
Author: R.P. Fender
Author: M. Armas Padila
Author: K. Mooley
Author: L. Hardy
Author: P.A. Charles
Author: G. Ponti
Author: S.E. Motta
Author: V.S. Dhillon
Author: P. Gandhi ORCID iD
Author: F. Jimenez-Ibarra
Author: T. Butterley
Author: S. Carey
Author: K.J.B. Grainge
Author: J. Hickish
Author: S.P. Littlefair
Author: Y.C. Perrott
Author: N. Razavi-Ghods
Author: C. Rumsey
Author: A.M.M. Scaife
Author: P.F. Scott
Author: D.J. Titterington
Author: R.W. Wilson

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