A VERITAS view of HESS J1857+026 within a multi-wavelength analysis

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.

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Publication Details

Journal
Maryland Shared Open Access Repository (USMAI Consortium)
Published
2025-12-19
DOI
https://doi.org/10.13016/m2eyro-gww4
Primary Topic
Astrophysics and Cosmic Phenomena
Type
article
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article

A VERITAS view of HESS J1857+026 within a multi-wavelength analysis

P.T.Reynolds, A. K. Talluri, J. T. Bartkoske, M. Kherlakian et al.
Maryland Shared Open Access Repository (USMAI Consortium)
Astrophysics and Cosmic Phenomena
article

A VERITAS view of HESS J1857+026 within a multi-wavelength analysis

P.T.Reynolds, A. K. Talluri, J. T. Bartkoske, M. Kherlakian, A. Furniss, M. Iskakova, P.L.Rabinowitz, Y. Q. Chen, M. Escobar Godoy, S. Satheesh Kumar, L. Saha, M. Santander, M. J. Lang, P. Bangale, M. Lundy, Q. X. Feng, J. L. Christiansen, R.A.Ong, M. Errando, J.Quinn, M. N. Johnson, E. Roache, C. E McGrath, G. H. Sembroski, S. L. Wong, G. Maier, J. Valverde, W. Benbow, L. Fortson, R. Mukherjee, E. Joshi, A.Pandey, D. Kieda, T. B. Humensky, B. Shen, O. Hervet, J. Escudero Pedrosa, I. Sadeh, W. Jin, S. Filbert, T. Yoshikoshi, N. Korzoun, VERITAS Collaboration, A. Duerr, K.Ragan, J. Holder, W.Ning, A. Archer, P. Moriarty, M. Splettstoesser, H. Salzmann, E.Pueschel, M.Pohl, M. Kertzman, S. Tandon, D. David Williams, V. V. Vassiliev, D.Ribeiro, T. K. Kleiner, A. J. Chromey, J. V. Tucci, W. Hanlon, C. E. Hinrichs
article en

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.

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