HAWC J2227+610 and its association with G106.3+2.7, a new potential Galactic PeVatron

preprint2020arXivOpen access

A. Albert R. Alfaro C. Alvarez J. R. Angeles Camacho J. C. Arteaga-Velázquez K. P. Arunbabu D. Avila Rojas H. A. Ayala Solares V. Baghmanyan E. Belmont-Moreno S. Y. BenZvi C. Brisbois K. S. Caballero-Mora T. Capistrán A. Carramiñana S. Casanova U. Cotti J. Cotzomi S. Coutiño de León E. de la Fuente L. Diaz-Cruz B. L. Dingus M. A. DuVernois J. C. Díaz-Vélez R. W. Ellsworth K. Engel C. Espinoza K. L. Fan K. Fang M. Fernández Alonso H. Fleischhack N. Fraija A. Galván-Gámez D. Garcia J. A. García-González F. Garfias G. Giacinti M. M. González J. A. Goodman J. P. Harding S. Hernandez J. Hinton B. Hona D. Huang F. Hueyotl-Zahuantitla P. Hüntemeyer A. Iriarte A. Jardin-Blicq V. Joshi W. H. Lee H. León Vargas J. T. Linnemann A. L. Longinotti G. Luis-Raya J. Lundeen K. Malone S. S. Marinelli O. Martinez I. Martinez-Castellanos J. Martínez-Castro J. A. Matthews P. Miranda-Romagnoli J. A. Morales-Soto E. Moreno M. Mostafá A. Nayerhoda L. Nellen M. Newbold M. U. Nisa R. Noriega-Papaqui N. Omodei A. Peisker Y. Pérez Araujo E. G. Pérez-Pérez C. D. Rho D. Rosa-González E. Ruiz-Velasco H. Salazar F. Salesa Greus A. Sandoval M. Schneider H. Schoorlemmer J. Serna Franco G. Sinnis A. J. Smith R. W. Springer P. Surajbali E. Tabachnick M. Tanner O. Tibolla K. Tollefson I. Torres R. Torres-Escobedo F. Ureña-Mena L. Villaseñor T. Weisgarber A. Zepeda H. Zhou C. de León J. D. Álvarez

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We present the detection of VHE gamma-ray emission above 100 TeV from HAWC J2227+610 with the HAWC observatory. Combining our observations with previously published results by VERITAS, we interpret the gamma-ray emission from HAWC J2227+610 as emission from protons with a lower limit in their cutoff energy of 800 TeV. The most likely source of the protons is the associated supernova remnant G106.3+2.7, making it a good candidate for a Galactic PeVatron. However, a purely leptonic origin of the observed emission cannot be excluded at this time.

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HAWC J2227+610 and its association with G106.3+2.7, a new potential Galactic PeVatron

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