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

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. (2016) High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst. Monthly Notices of the Royal Astronomical Society: Letters, 462 (1). L111-L115. ISSN 1745-3933. http://resolver.caltech.edu/CaltechAUTHORS:20161014-135515822

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Abstract

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. 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.


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1093/mnrasl/slw142DOIArticle
http://mnrasl.oxfordjournals.org/content/462/1/L111.abstractPublisherArticle
https://arxiv.org/abs/1607.06239arXivDiscussion Paper
ORCID:
AuthorORCID
Pearson, T.0000-0001-5213-6231
Additional Information:© 2016 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. Accepted 2016 July 14. Received 2016 July 13. In original form 2016 April 22. First published online July 19, 2016. We thank J. Miller-Jones, J. Ballet and J. Perkins for useful discussions and T. Siegert for providing the annihilation LC. AL, SC and JR acknowledge funding support from the French Research National Agency: CHAOS project ANR-12-BS05-0009 and the UnivEarthS Labex programme of Sorbonne Paris Cité (ANR-10-LABX-0023 and ANR-11-IDEX-0005-02). KM acknowledges funding support from the Hintze Foundation. The Fermi-LAT Collaboration acknowledges support for LAT development, operation and data analysis from NASA and DOE (USA), CEA/Irfu and IN2P3/CNRS (France), ASI and INFN (Italy), MEXT, KEK, and JAXA (Japan), and the K.A. Wallenberg Foundation, the Swedish Research Council and the National Space Board (Sweden). Science analysis support in the operations phase from INAF (Italy) and CNES (France) is also gratefully acknowledged. The OVRO 40-m monitoring programme is supported in part by NASA grants NNX08AW31G and NNX11A043G, and NSF grants AST-0808050 and AST-1109911. We acknowledge with thanks the variable star observations from the AAVSO. We acknowledge with thanks the variable star observations from the AAVSO International Database contributed by observers worldwide and used in this research.
Funders:
Funding AgencyGrant Number
Agence Nationale pour la Recherche (ANR)ANR-12-BS05-0009
Agence Nationale pour la Recherche (ANR)ANR-10-LABX-0023
Agence Nationale pour la Recherche (ANR)ANR-11-IDEX-0005-02
Hintze Family Charitable FoundationUNSPECIFIED
Department of Energy (DOE)UNSPECIFIED
Commissariat à l’Energie Atomique (CEA)UNSPECIFIED
Institut de recherche sur les lois fondamentales de l'Univers (Irfu)UNSPECIFIED
Institut National de Physique Nucléaire et de Physique des Particules (IN2P3)UNSPECIFIED
Centre National de la Recherche Scientifique (CNRS)UNSPECIFIED
Agenzia Spaziale Italiana (ASI)UNSPECIFIED
Istituto Nazionale di Fisica Nucleare (INFN)UNSPECIFIED
Ministry of Education, Culture, Sports, Science and Technology (MEXT)UNSPECIFIED
KEK (Japan)UNSPECIFIED
Japan Aerospace Exploration Agency (JAXA)UNSPECIFIED
K. A. Wallenberg FoundationUNSPECIFIED
Swedish Research Council UNSPECIFIED
Swedish National Space Board (SNSB)UNSPECIFIED
NASANNX08AW31G
NASANNX11A043G
NSFAST-0808050
NSFAST-1109911
Subject Keywords:black hole physics stars: individual: V404 Cygni gamma-rays: stars radio continuum: stars X-rays: binaries
Record Number:CaltechAUTHORS:20161014-135515822
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20161014-135515822
Official Citation:A. Loh, S. Corbel, G. Dubus, J. Rodriguez, I. Grenier, T. Hovatta, T. Pearson, A. Readhead, R. Fender, and K. Mooley High-energy gamma-ray observations of the accreting black hole V404 Cygni during its 2015 June outburst MNRAS (October 11, 2016) Vol. 462 L111-L115 doi:10.1093/mnrasl/slw142 first published online July 19, 2016
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:71115
Collection:CaltechAUTHORS
Deposited By: Ruth Sustaita
Deposited On:14 Oct 2016 21:21
Last Modified:14 Oct 2016 21:21

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