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High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst

Journal Article · · Monthly Notices of the Royal Astronomical Society: Letters
 [1];  [2];  [3];  [1];  [1];  [4];  [5];  [5];  [6];  [6]
  1. Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France). AIM Lab.
  2. Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France). AIM Lab.; Univ. of Orleans, Nancay (France). PSL Research Univ. Observatory of Paris. Radio-Astronomical Station of Nancay
  3. Grenoble Alpes Univ. (France); National Centre for Scientific Research (CNRS), Grenoble (France)
  4. Aalto Univ. Metsahovi Radio Observatory, Kylmala (Finland); Aalto Univ., Otaniemi (Finland). Dept. of Radio Science and Engineering
  5. California Inst. of Technology (CalTech), Pasadena, CA (United States)
  6. Univ. of Oxford (United Kingdom). Dept. of Astrophysics
In this paper, we report on Fermi/Large Area Telescope observations of the accreting black hole low-mass X-ray binary V404 Cygni during its outburst in 2015 June–July. Detailed analyses reveal a possible excess of γ-ray emission on 2015 26 June, with a very soft spectrum above 100 MeV, at a position consistent with the direction of V404 Cyg (within the 95 per cent confidence region and a chance probability of 4 × 10-4). This emission cannot be associated with any previously known Fermi source. Its temporal coincidence with the brightest radio and hard X-ray flare in the light curve of V404 Cyg, at the end of the main active phase of its outburst, strengthens the association with V404 Cyg. If the γ-ray emission is associated with V404 Cyg, the simultaneous detection of 511 keV annihilation emission by INTEGRAL reqires that the high-energy γ-rays originate away from the corona, possibly in a Blandford–Znajek jet. Finally, the data give support to models involving a magnetically arrested disc where a bright γ-ray jet can re-form after the occurrence of a major transient ejection seen in the radio.
Research Organization:
Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Organization:
Hintze Foundation (United Kingdom); National Aeronautics and Space Administration (NASA) (United States); National Science Foundation (NSF) (United States); The French National Research Agency (ANR) (France); USDOE
Contributing Organization:
Aalto Univ. Metsahovi Radio Observatory, Kylmala (Finland); Aalto Univ., Otaniemi (Finland); Fermi-LAT Collaboration; Grenoble Alpes Univ. (France); National Centre for Scientific Research (CNRS), Grenoble (France); Univ. of Orleans, Nancay (France); Univ. of Oxford (United Kingdom)
OSTI ID:
1355702
Journal Information:
Monthly Notices of the Royal Astronomical Society: Letters, Journal Name: Monthly Notices of the Royal Astronomical Society: Letters Journal Issue: 1 Vol. 462; ISSN 1745-3925
Publisher:
Royal Astronomical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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Cited By (12)

Disk-Jet Connection in Black Holes book October 2018
Phenomenology of gamma-ray emitting binaries journal February 2019
An elevation of 0.1 light-seconds for the optical jet base in an accreting Galactic black hole system journal October 2017
MAGIC observations of the microquasar V404 Cygni during the 2015 outburst journal July 2017
Optical and X-ray correlations during the 2015 outburst of the black hole V404 Cyg journal May 2019
Accretion and outflow in V404 Cyg journal July 2019
Gamma-rays from SS433: evidence for periodicity journal February 2019
MAGIC observations of the microquasar V404 Cygni during the 2015 outburst text January 2017
High-energy Gamma-Ray Activity from V404 Cygni Detected by AGILE during the 2015 June Outburst journal April 2017
High-energy gamma-ray activity from V404 Cygni detected by AGILE during the 2015 June outburst text January 2017
An elevation of 0.1 light-seconds for the optical jet base in an accreting Galactic black hole system preprint January 2017
Phenomenology of gamma-ray emitting binaries preprint January 2019

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