Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 506, Issue 4, Pages 6029-6038Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stab2097
Keywords
black hole physics; gamma-rays: stars; X-rays: binaries
Categories
Funding
- National Science Foundation
- Science and Technology Facilities Council (STFC) [ST/S505365/1]
- STFC [ST/P000541/1]
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Through analysis of data and background models, this study found no evidence of high energy gamma-ray emission from V404Cygni at any time, possibly due to confusion caused by its proximity to other emitting sources.
We revisit the well-studied outburst of the low-mass X-ray binary (LMXB) system V404Cygni, and claims of gamma-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 gamma-ray emission during the outburst period (or at any other time) from V404Cygni. This is due to the proximity of V404Cygni to the gamma-ray emitting blazar B2023+336, a luminous source approximately 0.3(circle) away, which causes source confusion at the position of V404Cygni, the luminous gamma-ray background, and the use of older background models and catalogues in previous studies.
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