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arxiv: 1703.01344 · v2 · submitted 2017-03-03 · 🌌 astro-ph.HE

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Search for Very High Energy Gamma Rays from the Northern textit{Fermi} Bubble Region with HAWC

A.U. Abeysekara , A. Albert , R. Alfaro , C. Alvarez , J.D. \'Alvarez , R. Arceo , J.C. Arteaga-Vel\'azquez , H.A. Ayala Solares
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A.S. Barber N. Bautista-Elivar A. Becerril E. Belmont-Moreno S.Y. BenZvi D. Berley J. Braun C. Brisbois K.S. Caballero-Mora T. Capistr\'an A. Carrami\~nana S. Casanova M. Castillo U. Cotti J. Cotzomi S. Couti\~no de Le\'on C. de Le\'on E. De la Fuente R. Diaz Hernandez B.L. Dingus M.A. DuVernois J.C. D\'iaz-V\'elez R.W. Ellsworth K. Engel B. Fick D.W. Fiorino H.Fleischhack N. Fraija J.A. Garc\'ia-Gonz\'alez F. Garfias M. Gerhardt A. Gonz\'alez Mu\~noz M.M. Gonz\'alez J.A. Goodman Z. Hampel-Arias J.P. Harding S. Hernandez A. Hernandez-Almada J. Hinton B. Hona C.M. Hui P. H\"untemeyer A. Iriarte A. Jardin-Blicq V. Joshi S. Kaufmann D.Kieda A. Lara R.J. Lauer W.H. Lee D. Lennarz H. Le\'on Vargas J.T. Linnemann A.L. Longinotti G. Luis Raya R. Luna-Garc\'ia R. L\'opez-Coto K. Malone S.S. Marinelli O. Martinez I. Martinez-Castellanos J. Mart\'inez-Castro H. Mart\'inez-Huerta J.A. Matthews P. Miranda-Romagnoli E. Moreno M. Mostaf\'a L. Nellen M. Newbold M.U. Nisa R. Noriega-Papaqui R. Pelayo J. Pretz E.G. P\'erez-P\'erez Z. Ren C.D. Rho C. Rivi\`ere D. Rosa-Gonz\'alez M. Rosenberg E. Ruiz-Velasco H. Salazar F. Salesa Greus A. Sandoval M. Schneider H. Schoorlemmer G. Sinnis A.J. Smith R.W. Springer P. Surajbali I. Taboada O. Tibolla K. Tollefson I. Torres T.N. Ukwatta G. Vianello T. Weisgarber S. Westerhoff I.G. Wisher J. Wood T. Yapici G.B. Yodh A. Zepeda H. Zhou
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keywords textbubblefermihighlimitsnorthernregiontextit
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We present a search of very high energy gamma-ray emission from the Northern $\textit{Fermi}$ Bubble region using data collected with the High Altitude Water Cherenkov (HAWC) gamma-ray observatory. The size of the data set is 290 days. No significant excess is observed in the Northern $\textit{Fermi}$ Bubble region, hence upper limits above $1\,\text{TeV}$ are calculated. The upper limits are between $3\times 10^{-7}\,\text{GeV}\, \text{cm}^{-2}\, \text{s}^{-1}\,\text{sr}^{-1}$ and $4\times 10^{-8}\,\text{GeV}\,\text{cm}^{-2}\,\text{s}^{-1}\,\text{sr}^{-1}$. The upper limits disfavor a proton injection spectrum that extends beyond $100\,\text{TeV}$ without being suppressed. They also disfavor a hadronic injection spectrum derived from neutrino measurements.

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