Accès ouvert déclaré
2022
preprint
The TeV Sun Rises: Discovery of Gamma rays from the Quiescent Sun with HAWC
R. Alfaro, C. Alvarez, J. C. Arteaga-Velázquez, D. Avila Rojas, H. A. Ayala Solares, R. Babu, T. Capistràn, A. Carraminana, S. Casanova, U. Cotti, J. Cotzomi, S. Coutinõ de León, R. Díaz Hernández, M. A. DuVernois, M. Durocher, J. C. Díaz–Vélez, R. W. Ellsworth, C. Espinoza, Kwok Lung Fan, M. Fernández Alonso, H. Fleischhack, N. Fraija, J. A. García-González, M. M. Gonzalez, J. A. Goodman, J. P. Harding, S. Hernandez, D. Huang, P. Huntemeyer, Vikas Joshi, S. Kaufmann, J. Lee, J. Linnemann, A. L. Longinotti, G. Luis-Raya, K. Malone, Oibar Martínez, J. Martinez-Castro, J. A. Matthews, P. Miranda-Romagnoli, J. A. Morales-Soto, E. Moreno, M. Mostafá, A. Nayerhoda, L. Nellen, M. U. Nisa, R. Noriega-Papaqui, Laura Olivera-Nieto, N. Omodei, E. G. Pérez‐Pérez, Chang Dong Rho, D. Rosa‐González, E. Ruiz-Velasco, H. Salazar, D. Salazar-Gallegos, A. Sandoval, M. Schneider, José Erandi Serna-Franco, A. J. Smith, Y. Son, R. W. Springer, O. Tibolla, K. Tollefson, I. Torres, R. Torres-Escobedo, Rhiannon M. Turner, F. Ureña-Mena, X. Wang, I. J. Watson, E. Willox, J. F. Beacom, T. Linden, Kenny C. Y. Ng, Annika H. G. Peter, B. Zhou
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Résumé fourni par la source
We report the first detection of a TeV gamma-ray flux from the solar disk (6.3$σ$), based on 6.1 years of data from the High Altitude Water Cherenkov (HAWC) observatory. The 0.5--2.6 TeV spectrum is well fit by a power law, dN/dE = $A (E/1 \text{ TeV})^{-γ}$, with $A = (1.6 \pm 0.3) \times 10^{-12}$ TeV$^{-1}$ cm$^{-2}$ s$^{-1}$ and $γ= -3.62 \pm 0.14$. The flux shows a strong indication of anticorrelation with solar activity. These results extend the bright, hard GeV emission from the disk observed with Fermi-LAT, seemingly due to hadronic Galactic cosmic rays showering on nuclei in the solar atmosphere. However, current theoretical models are unable to explain the details of how solar magnetic fields shape these interactions. HAWC's TeV detection thus deepens the mysteries of the solar-disk emission.
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Sujets associés
Solar and Space Plasma DynamicsDark Matter and Cosmic PhenomenaAstrophysics and Cosmic Phenomena