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The TeV Sun Rises: Discovery of Gamma rays from the Quiescent Sun with HAWC

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arxiv 2212.00815 v2 pith:2Y2FKBPP submitted 2022-12-01 astro-ph.HE astro-ph.SRhep-ex

The TeV Sun Rises: Discovery of Gamma rays from the Quiescent Sun with HAWC

A. Albert , R. Alfaro , C. Alvarez , J.C. Arteaga-Velazquez , D. Avila Rojas , H.A. Ayala Solares , R. Babu , E. Belmont-Moreno
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C. Brisbois K.S. Caballero-Mora T. Capistran A. Carraminana S. Casanova O. Chaparro-Amaro U. Cotti J. Cotzomi S. Coutino de Leon E. De la Fuente R. Diaz Hernandez B.L. Dingus M.A. DuVernois M. Durocher J.C. Diaz-Velez R.W. Ellsworth K. Engel C. Espinoza K.L. Fan K. Fang M. Fernandez Alonso H. Fleischhack N. Fraija J.A. Garcia-Gonzalez F. Garfia M.M. Gonzalez J.A. Goodman J.P. Harding S. Hernandez J. Hinton D. Huang F. Hueyotl-Zahuantitla P. Huntemeyer A. Iriarte V. Joshi S. Kaufmann J. Lee J.T. Linnemann A.L. Longinotti G. Luis-Raya K. Malone O. Martinez J. Martinez-Castro J.A. Matthews P. Miranda-Romagnoli J.A. Morales-Soto E. Moreno M. Mostafa A. Nayerhoda L. Nellen M.U. Nisa R. Noriega-Papaqui L. Olivera-Nieto N. Omodei Y. P\'erez Araujo E.G. Perez-Perez C.D. Rho D. Rosa-Gonzalez E. Ruiz-Velasco H. Salazar D. Salazar-Gallegos A. Sandoval M. Schneider J. Serna-Franco A.J. Smith Y. Son R.W. Springer O. Tibolla K. Tollefson I. Torres R. Torres-Escobedo R. Turner F. Urena-Mena X. Wang I.J. Watson E. Willox S. Yun-C\'arcamo H. Zhou C. de Le\'on J. F. Beacom T. Linden K. C. Y. Ng A. H. G. Peter B. Zhou
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classification astro-ph.HE astro-ph.SRhep-ex
keywords solargammahawcdetectiondiskemissionfluxrays
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We report the first detection of a TeV gamma-ray flux from the solar disk (6.3$\sigma$), 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 = $A (E/1 \text{ TeV})^{-\gamma}$, with $A = (1.6 \pm 0.3) \times 10^{-12}$ TeV$^{-1}$ cm$^{-2}$ s$^{-1}$ and $\gamma = -3.62 \pm 0.14$. 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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