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

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Abeysekara, A. U. ; Albert, A. ; Alfaro, R. ; Alvarez, C. ; Álvarez, J. D. ; Arceo, R. ; Arteaga-Velázquez, J. C. ; Solares, H. A. Ayala ; Barber, A. S. ; Bautista-Elivar, N. ; Becerril, A. ; Belmont-Moreno, E. ; BenZvi, S. Y. ; Berley, D. ; Braun, J. ; Brisbois, C. ; Caballero-Mora, K. S. ; Capistrán, T. ; Carramiñana, A. ; Casanova, S. ; Castillo, M. ; Cotti, U. ; Cotzomi, J. ; de León, S. Coutiño ; De León, C. ; De la Fuente, E. ; Hernandez, R. Diaz ; Dingus, B. L. ; DuVernois, M. A. ; Díaz-Vélez, J. C. ... view all 111 authors (2017)
  • Related identifiers: doi: 10.3847/1538-4357/aa751a
  • Subject: Astrophysics - High Energy Astrophysical Phenomena | HAWC - Abteilung Hinton
    arxiv: Computer Science::Information Retrieval | Computer Science::Computation and Language (Computational Linguistics and Natural Language and Speech Processing) | Astrophysics::High Energy Astrophysical Phenomena | High Energy Physics::Experiment

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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