Gamma-rays from SS433: evidence for periodicity

Rasul, Kajwan; Chadwick, Paula M; Graham, Jamie A; Brown, Anthony M

Abstract

In this paper we present our study of the gamma-ray emission from the microquasar SS433. Integrating over 9 yr of Fermi-LAT Pass 8 data, we detect SS433 with a significance of ∼13σ in the 200 to 500 MeV photon energy range, with evidence for an extension in the direction of the w1 X-ray ‘hotspot’. A temporal analysis reveals evidence for modulation of SS433’s gamma-ray emission with the precession period of its relativistic jet. This suggests that at least some of SS433’s gamma-ray emission originates close to the object rather than from the jet termination regions.

Citation

Rasul, K., Chadwick, P. M., Graham, J. A., & Brown, A. M. (2019). Gamma-rays from SS433: evidence for periodicity. Monthly Notices of the Royal Astronomical Society, 485(2), 2970-2975. https://doi.org/10.1093/mnras/stz559

• Journal Article Type: Article
• Acceptance Date: Feb 21, 2019
• Online Publication Date: Feb 28, 2019
• Publication Date: May 11, 2019
• Deposit Date: Mar 19, 2019
• Publicly Available Date: Mar 19, 2019
• 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: 485
• Issue: 2
• Pages: 2970-2975
• DOI: https://doi.org/10.1093/mnras/stz559
• Public URL: https://durham-repository.worktribe.com/output/1335228
• Related Public URLs: https://arxiv.org/abs/1903.00299