2015A&A...581L...9R


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST03:18:51

2015A&A...581L...9R - Astronomy and Astrophysics, volume 581, L9-9 (2015/9-1)

Correlated optical, X-ray, and γ-ray flaring activity seen with INTEGRAL during the 2015 outburst of V404 Cygni.

RODRIGUEZ J., CADOLLE BEL M., ALFONSO-GARZON J., SIEGERT T., ZHANG X.-L., GRINBERG V., SAVCHENKO V., TOMSICK J.A., CHENEVEZ J., CLAVEL M., CORBEL S., DIEHL R., DOMINGO A., GOUIFFES C., GREINER J., KRAUSE M.G.H., LAURENT P., LOH A., MARKOFF S., MAS-HESSE J.M., MILLER-JONES J.C.A., RUSSELL D.M. and WILMS J.

Abstract (from CDS):

After 25 years of quiescence, the microquasar V404 Cyg entered a new period of activity in June 2015. This X-ray source is known to undergo extremely bright and variable outbursts seen at all wavelengths. It is therefore an object of prime interest to understand the accretion-ejection connections. These can, however, only be probed through simultaneous observations at several wavelengths. We made use of the INTEGRAL instruments to obtain long, almost uninterrupted observations from 2015 June 20, 15:50 UTC to June 25, 4:05 UTC, from the optical V band up to the soft γ-rays. V404 Cyg was extremely variable in all bands, with the detection of 18 flares with fluxes exceeding 6Crab (20-40keV) within three days. The flare recurrence can be as short as ∼20 min from peak to peak. A model-independent analysis shows that the >6Crab flares have a hard spectrum. A simple 10-400keV spectral analysis of the off-flare and flare periods shows that the variation in intensity is likely to be only due to variations of a cut-off power-law component. The optical flares seem to be at least of two different types: one occurring in simultaneity with the X-ray flares, the other showing a delay greater than 10 min. The former could be associated with X-ray reprocessing by either an accretion disk or the companion star. We suggest that the latter are associated with plasma ejections that have also been seen in radio.

Abstract Copyright:

Journal keyword(s): accretion, accretion disks - X-rays: binaries - radio continuum: stars - stars: black holes - stars: individual: V404 Cygni

Simbad objects: 8

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Number of rows : 8

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* V381 Nor HXB 15 50 58.6520652623 -56 28 35.309070422   17.95 16.6     K3III 1021 0
2 V* V1033 Sco HXB 16 54 00.137 -39 50 44.90   15.20 14.2 16.14   F5IV 1699 1
3 V* V821 Ara HXB 17 02 49.3810714542 -48 47 23.163091737 16.20 16.30 15.5     ~ 1764 0
4 2MAXI J1753-013 LXB 17 53 28.2897263704 -01 27 06.256526637 15.30 16.73 16.46 16.15 15.64 ~ 280 0
5 V* V4641 Sgr HXB 18 19 21.6342721789 -25 24 25.849323550     13.654   13.092 B9III 386 1
6 Granat 1915+105 LXB 19 15 11.54938 +10 56 44.7585           ~ 2282 0
7 HD 226868 HXB 19 58 21.6758193269 +35 12 05.782512305 9.38 9.72 8.91 8.42   O9.7Iabpvar 3923 0
8 V* V404 Cyg HXB 20 24 03.820 +33 52 01.90 14.50 14.20 12.7     K0IV 1089 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-03:18:51

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