Speaker
Dr
Hiroyuki Sagawa
(Institute for Cosmic Ray Research, University of Tokyo)
Description
The Telescope Array (TA), located in Utah, USA, observes highest energy cosmic rays using Surface Detectors (SDs) and Fluorescence Detectors (FDs). The SD array consists of 507 scintillation detectors on a 1.2-km square grid covering 700 km^2. The FD sets located at three sites look over the surface array. Using the first 6-year data collected by the surface detectors, we found a cluster of cosmic rays with energies above 57 EeV that we call the hotspot. With enhanced statistics, we expect to observe the structure of that hotspot, other excess spots, point sources and the correlation with extreme phenomena in the nearby universe. Therefore, we plan to quadruple the SD array, which covers 3,000 km^2, by adding 500 surface detectors with 2.1-km spacing. Two FD stations will be constructed at the new SD array. This TA extension that we call TAx4 would speed up in the detection rate to elucidate the above objectives, the measurement of energy spectrum and composition study in the highest energy region. Here we present the plan of TAx4.
| Registration number following "ICRC2015-I/" | 849 |
|---|---|
| Collaboration | Telescope Array |
Author
Dr
Hiroyuki Sagawa
(Institute for Cosmic Ray Research, University of Tokyo)
