V404 Cygni with Fermi-LAT

Harvey, Max; Rulten, Cameron B; Chadwick, Paula M

Abstract

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.

Citation

Harvey, M., Rulten, C. B., & Chadwick, P. M. (2021). V404 Cygni with Fermi-LAT. Monthly Notices of the Royal Astronomical Society, 506(4), 6029-6038. https://doi.org/10.1093/mnras/stab2097

• Journal Article Type: Article
• Acceptance Date: Jul 18, 2021
• Online Publication Date: Jul 22, 2021
• Publication Date: 2021-10
• Deposit Date: Oct 29, 2021
• Publicly Available Date: Nov 10, 2021
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Royal Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 506
• Issue: 4
• Pages: 6029-6038
• DOI: https://doi.org/10.1093/mnras/stab2097
• Public URL: https://durham-repository.worktribe.com/output/1227000
• Related Public URLs: https://arxiv.org/abs/2107.09395