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High-energy Gamma-Ray Activity from V404 Cygni Detected by AGILE during the 2015 June Outburst

Piano G.
Munar-Adrover P.
Verrecchia F.
Tavani M.
Trushkin S.

Publication date

January 2017

Journal

The Astrophysical Journal

Abstract

© 2017. The American Astronomical Society. All rights reserved.The AGILE satellite detected transient high-energy γ-ray emission from the X-ray binary V404 Cygni, during the 2015 June outburst observed in radio, optical, X-ray, and soft γ-ray frequencies. The activity was observed by AGILE in the 50-400 MeV energy band, between 2015 June 24 UT 06:00:00 and 2015 June 26 UT 06:00:00 (MJD 57197.25-57199.25), with a detection significance of ∼4.3σ. The γ-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 ...

Extracted data

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