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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
Optical/X-ray correlations during the V404 Cygni June 2015 outburst
Astronomy and Astrophysics, Volume 620, Article A110, Year 2018
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Description
Context. We present a multiwavelength analysis of the simultaneous optical and X-ray light curves of the microquasar V404 Cyg during the June 2015 outburst. Aims. 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. Methods. We have identified all optical flares that have simultaneous X-ray observations, and performed a cross-correlation analysis to estimate the time delays between the optical and soft and hard X-ray emission. We also compared the evolution of the optical and X-ray emission with the hardness ratios. Results. We have identified several types of behaviour during the outburst. On many occasions, the optical flares occur simultaneously with X-ray flares, but at other times, positive and negative time delays between the optical and X-ray emission are measured. Conclusions. We conclude that the observed optical variability is driven by different physical mechanisms, including reprocessing of X-rays in the accretion disc and/or the companion star, interaction of the jet ejections with surrounding material or with previously ejected blobs, and synchrotron emission from the jet. © ESO 2018.
Authors & Co-Authors
Alfonso-Garzón, Julia
Spain
Centro de Astrobiología-departamento de Astrofísica Csic-inta
Sánchez-Fernández, Celia
Spain, Madrid
European Space Astronomy Centre
Charles, Philip A.
United Kingdom, Southampton
University of Southampton
Mas-Hesse, J. M.
Spain
Centro de Astrobiología-departamento de Astrofísica Csic-inta
Gandhi, Poshak R.
United Kingdom, Southampton
University of Southampton
Kimura, Mariko
Japan, Kyoto
Kyoto University
Domingo, Albert
Spain
Centro de Astrobiología-departamento de Astrofísica Csic-inta
Rodríguez, Jérôme Esteban
France, Paris
Insu - Institut National Des Sciences de L'univers
Chenevez, Jéfrôfme
Denmark, Lyngby
Technical University of Denmark
Statistics
Citations: 10
Authors: 9
Affiliations: 6
Identifiers
Doi:
10.1051/0004-6361/201834102
ISSN:
00046361
Research Areas
Environmental
Study Approach
Quantitative