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V404 Cygni with Fermi-LAT

Harvey, Max and Rulten, Cameron B and Chadwick, Paula M (2021) 'V404 Cygni with Fermi-LAT.', Monthly Notices of the Royal Astronomical Society, 506 (4). pp. 6029-6038.


We revisit the well-studied outburst of the low-mass X-ray binary (LMXB) system V404 Cygni, and claims of γ-ray excesses observed with the Fermi-LAT instrument. Upon analysing an 11.5 yr data set with the 8-yr LAT point source catalogue and 8-yr background models, we find no evidence to suggest that there is high energy γ-ray emission during the outburst period (or at any other time) from V404 Cygni. This is due to the proximity of V404 Cygni to the γ-ray emitting blazar B2023+336, a luminous source approximately 0.3○ away, which causes source confusion at the position of V404 Cygni, the luminous γ-ray background, and the use of older background models and catalogues in previous studies.

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Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society. ©: 2021 The Author(s). Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:18 July 2021
Date deposited:10 November 2021
Date of first online publication:22 July 2021
Date first made open access:10 November 2021

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