Volume 501 - 39th International Cosmic Ray Conference (ICRC2025) - Gamma-Ray Astrophysics
VERITAS Observations of the Microquasar SS 433
T.K. Kleiner*  on behalf of the VERITAS Collaboration
*: corresponding author
Full text: pdf
Pre-published on: September 23, 2025
Published on: —
Abstract
Microquasars are increasingly recognized as efficient particle accelerators, potentially contributing to the cosmic-ray flux up to the "knee". Among them, SS 433 stands out as a unique system with precessing relativistic jets embedded within the W50 supernova remnant. Recent detections of very- and ultra-high-energy gamma rays from SS 433 have solidified its role as a key laboratory for studying particle acceleration in jet-powered astrophysical sources.
We present results from over 100 hours of observations of SS 433 with VERITAS, spanning more than a decade. These high-resolution measurements allow for a detailed morphological study of the eastern and western jet lobes with an angular resolution of <0.1°. By analyzing the spatial and spectral characteristics of the gamma-ray emission, we investigate the particle acceleration mechanisms within the jets and at the jet-medium interaction in W50.
DOI: https://doi.org/10.22323/1.501.0712
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