Tentative evidence of spatially extended GeV emission from SS433/W50

Abstract

We analyze 10 years of Fermi-LAT data towards the SS433/W50 region. With the latest source catalog and diffuse background models, the gamma-ray excess from SS433/W50 is detected with a significance of 6σ in the photon energy range of 500 MeV - 10 GeV. Our analysis indicates that an extended flat disk morphology is preferred over a point-source description, suggesting that the GeV emission region is much larger than that of the TeV emission detected by HAWC. The size of the GeV emission is instead consistent with the extent of the radio nebula W50, a supernova remnant being distorted by the jets, so we suggest that the GeV emission may originate from this supernova remnant. The spectral result of the GeV emission is also consistent with an supernova remnant origin. We also derive the GeV flux upper limits on the TeV emission region, which put moderate constrains on the leptonic models to explain the multiwavelength data.

arXiv comment7 pages, 4 figures, accepted for publication in A&A

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Cited by in corpus (10)

• Acceleration and transport of relativistic electrons in the jets of the microquasar SS 433
• Deciphering the Origin of the GeV--TeV Gamma-ray Emission from SS 433
• Gamma-ray heartbeat powered by the microquasar SS 433
• Multi-wavelength Emission from Galactic Jets: the Case of the Microquasar SS433
• GeV-TeV Counterparts of SS 433/W50 from Fermi-LAT and HAWC Observations
• Continuous Jets and Backflow Models for the Formation of W50/SS433 in Magnetohydrodynamics Simulations
• Spatially resolved study of the SS 433/W50 west region with Chandra: X-ray structure and spectral variation of non-thermal emission
• Galactic Observatory Science with the ASTRI Mini-Array at the Observatorio del Teide
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• Galactic transient sources with the Cherenkov Telescope Array Observatory