Search for Very High-energy Gamma Rays from the Northern Fermi Bubble Region with HAWC

A. U. Abeysekara,A. Albert,R. Alfaro,C. Alvarez,J. D. Álvarez,R. Arceo,J.C. Arteaga-Velázquez,H. A. Ayala Solares,A. S. Barber,N. Bautista-Elivar,A. Becerril,E. Belmont-Moreno,S. BenZvi,D. Berley,Jürgen Braun, C. Brisbois,K. S. Caballero-Mora,T. Capistrán,A. Carramiñana,S. Casanova,M. Castillo,U. Cotti,J. Cotzomi,S. Coutiño de León,C. De León,E. de la Fuente,R. Diaz Hernandez,B. L. Dingus,M. A. DuVernois,J. C. Diaz-Velez,R. W. Ellsworth,K. Engel,B. Fick,D. W. Fiorino,H. Fleischhack,N. Fraija,J. A. García-González,F. Garfias,M. Gerhardt,A. González Muñoz,M. M. Gonzalez,J. A. Goodman,Z. Hampel-Arias,J. P. Harding,S. Hernandez,A. Hernandez-Almada,J. A. Hinton,B. Hona,C. M. Hui,P. Hüntemeyer,A. Iriarte, A. Jardin-Blicq,V. Joshi,S. Kaufmann,D. Kieda,Alejandro Lara,R. Lauer,W. H. Lee,D. Lennarz,H. León Vargas,J. Linnemann,A. L. Longinotti,G. Luis Raya,R. Luna-Garcia,R. López-Coto,K. Malone,S. S. Marinelli,O. Martinez,I. Martinez-Castellanos,J. Martínez-Castro,H. Martínez-Huerta,J. A. J. Matthews,P. Miranda-Romagnoli,E. Moreno,M. Mostafá,L. Nellen,M. Newbold,M. U. Nisa,R. Noriega-Papaqui,R. Pelayo,J. Pretz,E. G. Pérez-Pérez,Z. Ren,C. D. Rho,C. Rivière,D. Rosa-González,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. Yodh,A. Zepeda,H. Zhou

ASTROPHYSICAL JOURNAL（2017）

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摘要

We present a search for very high-energy gamma-ray emission from the Northern Fermi Bubble region using data collected with the High Altitude Water Cherenkov gamma-ray observatory. The size of the data set is 290 days. No significant excess is observed in the Northern Fermi Bubble region, so upper limits above 1 TeV are calculated. The upper limits are between 3 x 10(-7) GeV cm(-2) s(-1) sr(-1) and 4 x 10(-8) GeV cm(-2) s(-1) sr(-1). The upper limits disfavor a proton injection spectrum that extends beyond 100 TeV without being suppressed. They also disfavor a hadronic injection spectrum derived from neutrino measurements.

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关键词

astroparticle physics,Galaxy: general,Galaxy: structure,gamma rays: diffuse background

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