2018A&A...620A.110A


Query : 2018A&A...620A.110A

2018A&A...620A.110A - Astronomy and Astrophysics, volume 620A, 110-110 (2018/12-1)

Optical/X-ray correlations during the V404 Cygni June 2015 outburst.

ALFONSO-GARZON J., SANCHEZ-FERNANDEZ C., CHARLES P.A., MAS-HESSE J.M., GANDHI P., KIMURA M., DOMINGO A., RODRIGUEZ J. and CHENEVEZ J.

Abstract (from CDS):


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.

Abstract Copyright: © ESO 2018

Journal keyword(s): X-rays: binaries - stars: black holes - accretion, accretion disks

Simbad objects: 7

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Number of rows : 7
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 V* KV UMa HXB 11 18 10.7930420496 +48 02 12.314730120     12.25     K5V-M1V 768 0
2 V* V818 Sco LXB 16 19 55.0692669024 -15 38 25.017666540 11.60 12.40 11.1     Oev 1577 0
3 V* V821 Ara HXB 17 02 49.3876391280 -48 47 23.087954544 16.20 16.30 15.5     ~ 1934 0
4 [KRL2007b] 222 LXB 17 09 07.61 -36 24 25.7           ~ 244 1
5 SS 433 HXB 19 11 49.5647697480 +04 58 57.827127648   16.3 13.0     A7Ib: 2028 4
6 Granat 1915+105 HXB 19 15 11.55576 +10 56 44.9052           ~ 2454 0
7 V* V404 Cyg HXB 20 24 03.8254458776 +33 52 01.962185735           G9/K0III/V 1186 0

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2022.08.18-03:38:10

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