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

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.
Authors:
 [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
Publication Date:
Grant/Contract Number:
NNX08AW31G; NNX11A043G; AST-0808050; AST-1109911; ANR-12-BS05-0009; ANR-10-LABX-0023; ANR-11-IDEX-0005-02
Type:
Accepted Manuscript
Journal Name:
Monthly Notices of the Royal Astronomical Society: Letters
Additional Journal Information:
Journal Volume: 462; Journal Issue: 1; Journal ID: ISSN 1745-3925
Publisher:
Royal Astronomical Society
Research Org:
Alternative Energies and Atomic Energy Commission (CEA-Saclay), Gif-sur-Yvette (France); California Inst. of Technology (CalTech), Pasadena, CA (United States)
Sponsoring Org:
USDOE; National Aeronautic and Space Administration (NASA); National Science Foundation (NSF); The French National Research Agency (ANR) (France); Hintze Foundation (United Kingdom)
Contributing Orgs:
Fermi-LAT Collaboration; Grenoble Alpes Univ. (France); National Centre for Scientific Research (CNRS), Grenoble (France); Univ. of Orleans, Nancay (France); Aalto Univ. Metsahovi Radio Observatory, Kylmala (Finland); Aalto Univ., Otaniemi (Finland); Univ. of Oxford (United Kingdom)
Country of Publication:
United States
Language:
English
Subject:
79 ASTRONOMY AND ASTROPHYSICS; black hole physics; V404 Cygni star; gamma-rays; radio continuum; X-rays binaries
OSTI Identifier:
1355702

Loh, A., Corbel, S., Dubus, G., Rodriguez, J., Grenier, I., Hovatta, T., Pearson, T., Readhead, A., Fender, R., and Mooley, K.. High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst. United States: N. p., Web. doi:10.1093/mnrasl/slw142.
Loh, A., Corbel, S., Dubus, G., Rodriguez, J., Grenier, I., Hovatta, T., Pearson, T., Readhead, A., Fender, R., & Mooley, K.. High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst. United States. doi:10.1093/mnrasl/slw142.
Loh, A., Corbel, S., Dubus, G., Rodriguez, J., Grenier, I., Hovatta, T., Pearson, T., Readhead, A., Fender, R., and Mooley, K.. 2016. "High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst". United States. doi:10.1093/mnrasl/slw142. https://www.osti.gov/servlets/purl/1355702.
@article{osti_1355702,
title = {High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst},
author = {Loh, A. and Corbel, S. and Dubus, G. and Rodriguez, J. and Grenier, I. and Hovatta, T. and Pearson, T. and Readhead, A. and Fender, R. and Mooley, K.},
abstractNote = {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.},
doi = {10.1093/mnrasl/slw142},
journal = {Monthly Notices of the Royal Astronomical Society: Letters},
number = 1,
volume = 462,
place = {United States},
year = {2016},
month = {7}
}