Optical and X-ray observations of the microquasar V404 Cyg during its June 2015 outburst

J. Alfonso-Garzon*, C. Sanchez-Fernandez, P. A. Charles, J. M. Mas-Hesse, P. Gandhi, M. Kimura, A. Domingo, J. Rodriguez, J. Chenevez

*Corresponding author for this work

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Abstract

We present a multiwavelength analysis of the simultaneous optical and X-ray light curves of the microquasar V404 Cyg during the June 2015 outburst. We have performed a comprehensive analysis of all the INTEGRAL/IBIS, JEM-X, and OMC observations during the brightest epoch of the outburst, along with complementary NuSTAR, AAVSO, and VSNET data, to examine the timing relationship between the simultaneous optical and X-ray light curves, in order to understand the emission mechanisms and physical locations. We identified all optical ares with simultaneous X-ray observations, and performed cross-correlation analysis to estimate the time delays between the optical and soft and hard X-ray emission.
We have also compared the evolution of the optical and X-ray emission with the hardness-ratios. From this analysis, we identified several types of behaviour during the outburst, including simultaneous optical/X-ray ares, optical ares lagging the X-ray ares, and optical emission preceding the X-ray emission.
Original languageEnglish
Title of host publicationHighlights on Spanish Astrophysics X, Proceedings of the XIII Scientific Meeting of the Spanish Astronomical Society
EditorsB. Montesinos, A. Asensio Ramos, F. Buitrago , R. Schödel , E. Villaver, S. Pérez-Hoyos, I. Ordóñez-Etxeberria
PublisherLa Sociedad Española de Astronomía
Publication date2019
Pages255-260
Publication statusPublished - 2019
EventXIII Scientific Meeting of the Spanish Astronomical Society - Salamanca, Spain
Duration: 16 Jul 201820 Jul 2018

Conference

ConferenceXIII Scientific Meeting of the Spanish Astronomical Society
CountrySpain
CitySalamanca
Period16/07/201820/07/2018

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