دورية أكاديمية
Small-scale anisotropy of cosmic rays above 10^19eV observed with the Akeno Giant Air Shower Array
| العنوان: | Small-scale anisotropy of cosmic rays above 10^19eV observed with the Akeno Giant Air Shower Array |
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| المؤلفون: | Takeda, M., Hayashida, N., Honda, K., Inoue, N., Kadota, K., Kakimoto, F., Kamata, K., Kawaguchi, S., Kawasaki, Y., Kawasumi, N., Kusano, E., Matsubara, Y., Murakami, K., Nagano, M., Nishikawa, D., Ohoka, H., Osone, S., Sakaki, N., Sasaki, M., Shinozaki, K., Souma, N., Teshima, M., Torii, R., Tsushima, I., Uchihori, Y., Yamamoto, T., Yoshida, S., Yoshii, H. |
| سنة النشر: | 1999 |
| المجموعة: | ArXiv.org (Cornell University Library) |
| مصطلحات موضوعية: | Astrophysics |
| الوصف: | With the Akeno Giant Air Shower Array (AGASA), 581 cosmic rays above 10^19eV, 47 above 4 x 10^19eV, and 7 above 10^20eV are observed until August 1998. Arrival direction distribution of these extremely high energy cosmic rays has been studied. While no significant large-scale anisotropy is found on the celestial sphere, some interesting clusters of cosmic rays are observed. Above 4 x 10^19eV, there are one triplet and three doublets within separation angle of 2.5^o and the probability of observing these clusters by a chance coincidence under an isotropic distribution is smaller than 1 %. Especially the triplet is observed against expected 0.05 events. The cos(\theta_GC) distribution expected from the Dark Matter Halo model fits the data as well as an isotropic distribution above 2 x 10^19eV and 4 x 10^19eV, but is a poorer fit than isotropy above 10^19eV. Arrival direction distribution of seven 10^20eV cosmic rays is consistent with that of lower energy cosmic rays and is uniform. Three of seven are members of doublets above about 4 x 10^19eV. ; Comment: 40 pages, 12 figure, AASTeX *** Authors found a typo on Table 2 -- Energy of event 94/07/06 *** |
| نوع الوثيقة: | text |
| اللغة: | unknown |
| العلاقة: | http://arxiv.org/abs/astro-ph/9902239Test; Astrophys.J.522:225-237,1999 |
| DOI: | 10.1086/307646 |
| الإتاحة: | https://doi.org/10.1086/307646Test http://arxiv.org/abs/astro-ph/9902239Test |
| رقم الانضمام: | edsbas.235870EC |
| قاعدة البيانات: | BASE |
| DOI: | 10.1086/307646 |
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