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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
Flares, wind and nebulae: The 2015 December mini-outburst of V404 Cygni
Monthly Notices of the Royal Astronomical Society: Letters, Volume 465, No. 1, Year 2017
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Description
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-1 . Nebular-like spectra - with an Ha 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. © 2016 The Authors.
Authors & Co-Authors
Muñoz-Darías, Teodoro
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Casares, J.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
United Kingdom, Oxford
University of Oxford
Mata Sánchez, Daniel
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Fender, Robert P.
United Kingdom, Oxford
University of Oxford
Armas-Padilla, Montserrat
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Mooley, Kunal P.
United Kingdom, Oxford
University of Oxford
Hardy, Liam K.
United Kingdom, Sheffield
The University of Sheffield
Charles, Philip A.
United Kingdom, Oxford
University of Oxford
United Kingdom, Southampton
University of Southampton
Ponti, Gabriele
Germany, Garching Bei Munchen
Max Planck Institute for Extraterrestrial Physics
Motta, Sara Elisa
United Kingdom, Oxford
University of Oxford
Gandhi, Poshak R.
United Kingdom, Southampton
University of Southampton
Jiménez-Ibarra, F.
Spain, San Cristobal de la Laguna
Instituto Astrofisico de Canarias
Spain, San Cristobal de la Laguna
Universidad de la Laguna
Butterley, Timothy
United Kingdom, Durham
Durham University
Carey, Steven H.
United Kingdom, Cambridge
Department of Physics
Grainge, Keith J.B.
United Kingdom, Manchester
The University of Manchester
Hickish, Jack
United Kingdom, Cambridge
Department of Physics
Littlefair, Stuart P.
United Kingdom, Southampton
University of Southampton
Perrott, Yvette C.
United Kingdom, Cambridge
Department of Physics
Razavi-Ghods, Nima
United Kingdom, Cambridge
Department of Physics
Rumsey, Clare
United Kingdom, Cambridge
Department of Physics
Scaife, Anna M.M.
United Kingdom, Manchester
The University of Manchester
Scott, Paul F.
United Kingdom, Cambridge
Department of Physics
Titterington, David J.
United Kingdom, Cambridge
Department of Physics
Wilson, Richard W.
United Kingdom, Durham
Durham University
Statistics
Citations: 36
Authors: 24
Affiliations: 9
Identifiers
Doi:
10.1093/mnrasl/slw222
ISSN:
17453925
Study Design
Cohort Study