par Ivanov, Dmitri;Pshirkov, Maxims 
;Thomson, Gordon;Tiniakov, Petr ;Tirone, Alicia;Urban, Federico
Référence Pos proceedings of science, 30-July-2015, 350
Publication Publié, 2015-07-30
;Thomson, Gordon;Tiniakov, Petr ;Tirone, Alicia;Urban, Federico Référence Pos proceedings of science, 30-July-2015, 350
Publication Publié, 2015-07-30
Article révisé par les pairs
| Résumé : | Cosmic rays in the energy range 1 - 3 EeV are thought to have a light, probably protonic, composition. To study their origin one can search for anisotropy in their arrival directions: extragalactic cosmic rays should be isotropic, but galactic cosmic rays of this type should be seen mostly along the galactic plane, and there should be a shortage of events coming from directions near the galactic anticenter. Guided by models of the galactic magnetic field that indicate that the enhancement along the galactic plane should have a standard deviation of 20o - 35o in galactic latitude, and the deficit in the galactic anticenter direction should have a standard deviation of about 50o, we use the data of the Telescope Array experiment to search for these effects. Neither an enhancement along the galactic plane nor a deficit in the galactic anticenter direction is found. Using these data we place an upper limit on the fraction of EeV cosmic rays of galactic origin at 0.9% at 90% confidence level. |
