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
- Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France). AIM Lab.
- 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
- Grenoble Alpes Univ. (France); National Centre for Scientific Research (CNRS), Grenoble (France)
- Aalto Univ. Metsahovi Radio Observatory, Kylmala (Finland); Aalto Univ., Otaniemi (Finland). Dept. of Radio Science and Engineering
- California Inst. of Technology (CalTech), Pasadena, CA (United States)
- 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
Similar Records
High-energy Gamma-Ray Activity from V404 Cygni Detected by AGILE during the 2015 June Outburst
Giant Metrewave Radio Telescope Monitoring of the Black Hole X-Ray Binary, V404 Cygni during Its 2015 June Outburst
The 2015 decay of the black hole X-ray binary V404 Cygni: robust disk-jet coupling and a sharp transition into quiescence
Journal Article
·
Thu Apr 20 00:00:00 EDT 2017
· Astrophysical Journal
·
OSTI ID:22663703
Giant Metrewave Radio Telescope Monitoring of the Black Hole X-Ray Binary, V404 Cygni during Its 2015 June Outburst
Journal Article
·
Sun Sep 10 00:00:00 EDT 2017
· Astrophysical Journal
·
OSTI ID:22679873
The 2015 decay of the black hole X-ray binary V404 Cygni: robust disk-jet coupling and a sharp transition into quiescence
Journal Article
·
Mon Jan 09 23:00:00 EST 2017
· Astrophysical Journal
·
OSTI ID:22869547