Studies on the VHE spectrum of the radio galaxy M87 observed by HAWC
We report the detection of TeV gamma-ray emission from M87 with the High Altitude Water Cherenkov (HAWC) observatory, marking the first time its time-integrated TeV spectrum has been measured over an extended period of approximately 6 years. The emission is consistent with a power-law spectrum with index $\alpha = 2.53 \pm 0.29$ and flux normalization $(7.09 \pm 1.24) \times 10^{-13}$ cm$^{-2}$ s$^{-1}$ TeV$^{-1}$ at 1 TeV, extending up to 26.5 TeV at a 1$\sigma$ confidence level. This result provides the most detailed characterization of the very-high-energy (VHE) emission of M87, derived from the longest temporal coverage up to date, and offers new constraints on particle acceleration in radio galaxies.
Authors
- T. Capistrán (ORCID: https://orcid.org/0000-0003-2158-2292)
- José Serna-Franco (ORCID: https://orcid.org/0009-0007-7409-4061)
- Ruben Jose Alfaro
- Mabel Osorio
- M. M. González (ORCID: https://orcid.org/0000-0002-5209-5641)
- D. Avila Rojas (ORCID: https://orcid.org/0000-0002-4020-4142)
Publication Details
- Published
- 2025-09-24
- DOI
- https://doi.org/10.22323/1.501.0789
- Primary Topic
- Astrophysics and Cosmic Phenomena
- Type
- article
- Field-Weighted Citation Impact
- 0.00
Funders
- National Science Foundation
- U.S. Department of Energy
- National Aeronautics and Space Administration
- European Commission
- National Research Foundation
- Consejo Nacional de Ciencia y Tecnología
- National Research Foundation of Korea
- Benemérita Universidad Autónoma de Puebla
- Office of National Higher Education Science Research and Innovation Policy Council
- Goddard Space Flight Center
- Dirección General de Asuntos del Personal Académico, Universidad Nacional Autónoma de México
- Coordinación de la Investigación Científica
- Institute for Cosmic Ray Research, University of Tokyo
- Laboratory Directed Research and Development
- Los Alamos National Laboratory