1998/07/31 by N Hayashida, AGASA Collaboration, N. Hayashida +33 · 9 citations
Earth and Planetary Sciences · Physics and Astronomy · #Air shower #Anisotropy #Astrophysics and Cosmic Phenomena #Center (category theory) #Cosmic ray #Dark Matter and Cosmic Phenomena #Earth Systems and Cosmic Evolution #Galactic Center #Gamma ray #Right ascension #Spherical harmonics #astro-ph
paper · pdf · doi:10.1016/s0927-6505(98)00064-4
published as Astropart.Phys. 10 (1999) 303-311 · 17 pages with 16 figures, http://www.icrr.u-tokyo.ac.jp/~erina/English.html
openalex publication_date 1999/05/01 · arxiv created 1999/05/15 · arxiv updated 2015/06/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
Anisotropy in the arrival directions of cosmic rays with energies above 1017eV is studied using data from the Akeno 20 km2 array and the Akeno Giant Air Shower Array (AGASA), using a total of about 117,000 showers observed during 11 years. In the first harmonic analysis, we have found strong anisotropy of ∼ 4% around 1018eV, corresponding to a chance probability of 0.2%. With two dimensional analysis in right ascension and declination, this anisotropy is interpreted as an excess of showers near the directions of the Galactic Center and the Cygnus region.