| Literature DB >> 29146808 |
A U Abeysekara1, A Albert2, R Alfaro3, C Alvarez4, J D Álvarez5, R Arceo4, J C Arteaga-Velázquez5, D Avila Rojas3, H A Ayala Solares6, A S Barber1, N Bautista-Elivar7, A Becerril3, E Belmont-Moreno3, S Y BenZvi8, D Berley9, A Bernal10, J Braun11, C Brisbois6, K S Caballero-Mora4, T Capistrán12, A Carramiñana12, S Casanova13,14, M Castillo5, U Cotti5, J Cotzomi15, S Coutiño de León12, C De León15, E De la Fuente16, B L Dingus2, M A DuVernois11, J C Díaz-Vélez16, R W Ellsworth17, K Engel9, O Enríquez-Rivera18, D W Fiorino9, N Fraija10, J A García-González3, F Garfias10, M Gerhardt6, A González Muñoz3, M M González10, J A Goodman9, Z Hampel-Arias11, J P Harding2, S Hernández3, A Hernández-Almada3, J Hinton14, B Hona6, C M Hui19, P Hüntemeyer6, A Iriarte10, A Jardin-Blicq14, V Joshi14, S Kaufmann4, D Kieda1, A Lara18, R J Lauer20, W H Lee10, D Lennarz21, H León Vargas3, J T Linnemann22, A L Longinotti12, G Luis Raya7, R Luna-García23, R López-Coto24, K Malone25, S S Marinelli22, O Martinez15, I Martinez-Castellanos9, J Martínez-Castro23, H Martínez-Huerta26, J A Matthews20, P Miranda-Romagnoli27, E Moreno15, M Mostafá25, L Nellen28, M Newbold1, M U Nisa8, R Noriega-Papaqui27, R Pelayo23, J Pretz25, E G Pérez-Pérez7, Z Ren20, C D Rho8, C Rivière9, D Rosa-González12, M Rosenberg25, E Ruiz-Velasco3, H Salazar15, F Salesa Greus29, A Sandoval3, M Schneider30, H Schoorlemmer14, G Sinnis2, A J Smith9, R W Springer1, P Surajbali14, I Taboada21, O Tibolla4, K Tollefson22, I Torres12, T N Ukwatta2, G Vianello31, T Weisgarber11, S Westerhoff11, I G Wisher11, J Wood11, T Yapici22, G Yodh32, P W Younk2, A Zepeda26,4, H Zhou33, F Guo2, J Hahn14, H Li2, H Zhang2.
Abstract
The unexpectedly high flux of cosmic-ray positrons detected at Earth may originate from nearby astrophysical sources, dark matter, or unknown processes of cosmic-ray secondary production. We report the detection, using the High-Altitude Water Cherenkov Observatory (HAWC), of extended tera-electron volt gamma-ray emission coincident with the locations of two nearby middle-aged pulsars (Geminga and PSR B0656+14). The HAWC observations demonstrate that these pulsars are indeed local sources of accelerated leptons, but the measured tera-electron volt emission profile constrains the diffusion of particles away from these sources to be much slower than previously assumed. We demonstrate that the leptons emitted by these objects are therefore unlikely to be the origin of the excess positrons, which may have a more exotic origin.Year: 2017 PMID： 29146808 DOI： 10.1126/science.aan4880
Source DB: PubMed Journal: Science ISSN： 0036-8075 Impact factor: 47.728