High-energy gamma-ray activity from V404 Cygni detected by AGILE during the 2015 June outburst

Abstract

The AGILE satellite detected transient high-energy gamma-ray emission from the X-ray binary V404 Cygni, during the June 2015 outburst observed in radio, optical, X-ray and soft gamma-ray frequencies. The activity was observed by AGILE in the 50-400 MeV energy band, between 2015-06-24 UT 06:00:00 and 2015-06-26 UT 06:00:00 (MJD 57197.25 - 57199.25), with a detection significance of $\sim 4.3\sigma$. The gamma-ray detection, consistent with a contemporaneous observation by Fermi-LAT, is correlated with a bright flare observed at radio and hard X-ray frequencies, and with a strong enhancement of the 511 keV line emission, possibly indicating plasmoid ejections in a lepton-dominated transient jet. The AGILE observations of this binary system are compatible with a microquasar scenario in which transient jets are responsible for the high-energy gamma-ray emission.

Accepted for publication in ApJ on March 9, 2017

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• Simultaneous multiwavelength observations of V404 Cygni during its 2015 June outburst decay strengthen the case for an extremely energetic jet-base
• Rapid Optical Variations Correlated with X-rays in the 2015 Second Outburst of V404 Cygni (GS 2023$+$338)
• The December 2015 re-brightening of V404 Cyg: Variable absorption from the accretion disc outflow
• Gamma-ray observations of MAXI J1820+070 during the 2018 outburst
• Electron transport with re-acceleration and radiation in the jets of X-ray binaries
• V404 Cygni with Fermi-LAT
• Searching for High Energy, Horizon-scale Emissions from Galactic Black Hole Transients during Quiescence
• Galactic transient sources with the Cherenkov Telescope Array Observatory
• AGILE study of the gamma-ray emission from the SNR G78.2+2.1 (Gamma Cygni)
• Extending the "Energetic Scaling of Relativistic Jets From Black Hole Systems" to Include $\gamma$-ray-loud X-ray Binaries
• Detection of the microquasar V404 Cygni at gamma-rays revisited: short flaring events in quiescence
• A Very-High-Energy Gamma-Ray View of the Transient Sky
• Extreme Transients in Gamma Rays