Volume 501 - 39th International Cosmic Ray Conference (ICRC2025) - Gamma-Ray Astrophysics
A VERITAS view of HESS J1857+026 within a multi-wavelength analysis
Y. Chen*  on behalf of the VERITAS Collaboration
*: corresponding author
Full text: pdf
Pre-published on: September 23, 2025
Published on: —
Abstract
HESS J1857+026 remains a mysterious gamma-ray emitter since its discovery in 2008. Despite
the disclosure of a nearby pulsar and multiple studies in the high-energy (HE, E > 100 MeV) and
very-high-energy (VHE, E > 100 GeV) regimes, there have been no confirmed counterparts (e.g.,
an SNR shell or other extended structure) in X-ray or other wavelengths. We present the result of
our study of the VHE emission of HESS J1857+026 with VERITAS as part of a multi-wavelength
investigation to uncover its emission mechanisms. Our result confirms the extended nature of
the source and we characterize its spectral and morphological features in the VHE band. Using
the morphology of the source revealed in our analysis, we also explore the underlying transport
process of a possible electron population in a leptonic PWN scenario for the gamma-ray emission.
DOI: https://doi.org/10.22323/1.501.0601
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