Bibcode
Lipunov, V. M.; Gorbovskoy, E.; Kornilov, V.; Krushinskiy, V.; Vlasenko, D.; Tiurina, N.; Balanutsa, P.; Kuznetsov, A.; Budnev, N.; Gress, O.; Tlatov, A.; Rebolo, R.; Serra-Ricart, M.; Buckley, D. A. H.; Israelyan, G.; Lodieu, N.; Ivanov, K.; Yazev, S.; Sergienko, Yu.; Gabovich, A.; Yurkov, V.; Levato, H.; Saffe, C.; Podesta, R.; Mallamaci, C.; Lopez, C.
Bibliographical reference
The Astrophysical Journal, Volume 833, Issue 2, article id. 198, 12 pp. (2016).
Advertised on:
12
2016
Journal
Citations
17
Refereed citations
16
Description
On 2015 June 15, the Swift space observatory discovered that the
Galactic black hole candidate V404 Cyg was undergoing another active
X-ray phase, after 25 years of inactivity. The 12 telescopes of the
MASTER Global Robotic Net located at six sites across four continents
were the first ground-based observatories to start optical monitoring of
the microquasar after its gamma-ray wake up at 18h
34m 09s U.T. on 2015 June 15. In this paper, we
report, for the first time, the discovery of variable optical linear
polarization, changing by 4%–6% over a timescale of ∼1 hr, on
two different epochs. We can conclude that the additional variable
polarization arises from the relativistic jet generated by the black
hole in V404 Cyg. The polarization variability correlates with optical
brightness changes, increasing when the flux decreases.