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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/29380
Title: Flares, wind and nebulae: the 2015 December mini-outburst of V404 Cygni
Authors: Muñoz-Darias, T.
Casares, J.
Mata Sánchez, D.
Fender, R. P.
Armas Padilla, M.
Mooley, K.
Hardy, L.
Charles, P. A.
PONTI, GABRIELE 
Motta, S. E.
Dhillon, V. S.
Gandhi, P.
Jiménez-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.
Wilson, R. W.
Issue Date: 2017
Journal: MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 
Number: 465
Issue: 1
First Page: L124
Abstract: After more than 26 years in quiescence, the black hole transient V404 Cyg went into a luminous outburst in 2015 June, 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 d 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 Å) with a terminal velocity of ∼2500 km s<SUP>-1</SUP> . Nebular-like spectra - with an Hα equivalent width of ∼500 Å - are also observed. All these features are similar to those seen during the main 2015 June 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 2016 January, when X-ray and optical monitoring had stopped due to Sun constraints.
URI: http://hdl.handle.net/20.500.12386/29380
URL: https://academic.oup.com/mnrasl/article/465/1/L124/2417278
ISSN: 0035-8711
DOI: 10.1093/mnrasl/slw222
Bibcode ADS: 2017MNRAS.465L.124M
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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