2012 Fiscal Year Final Research Report
Exploration of sources of ultra high-energy cosmic rays with GeV-TeV gamma-ray observations
| Project/Area Number |
22740117
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| Research Category |
Grant-in-Aid for Young Scientists (B)
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| Allocation Type | Single-year Grants |
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| Research Field |
Astronomy
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| Research Institution | Tokyo Institute of Technology |
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Principal Investigator |
ASANO Katsuaki 東京工業大学, 大学院・理工学研究科, 助教 (80399279)
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| Project Period (FY) |
2010 – 2012
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| Keywords | 理論天文学 |
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| Research Abstract |
The sources of ultra high-energy cosmic rays (UHECRs) are unknown. In acceleration sites, high-energy protons can interact with ambient matters/photons, and emit characteristic GeV-TeV gamma-rays. Recently Fermi satellite or Air Cherenkov Telescopes have discovered new gamma-ray sources. I developed a code to simulate cascade processes in the acceleration sites, and succeeded in improving this to one that can follow temporal evolution in this research period. By comparing our results with observations, we have studied gamma-ray sources as possible acceleration sites. Especially, GeV gamma-rays from gamma-ray bursts (GRBs) are promising candidates of hadronic emissions. I have greatly contributed to exploration of the emission mechanism of GRBs as a member of the Fermi team. Unfortunately, the present available data of gamma-rays are not statistically enough to reveal the sources of UHECRs. But, from our results based on the code we have developed, we found characteristic spectral evolutions in hadronic emissions. This is an important result that can be verified with future observations such as CTA, which will determine the sources of UHECRs.
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[Presentation] Wide-band spectra of prompt emission2012
Author(s)
Katsuaki Asano
Organizer
FALL 2012 GAMMA-RAY BURST SYMPOSIUM:15 years of afterglow discoveries: progenitors, environments and host galaxies from the nearby to the early Universe
Place of Presentation
Palacio de Congresos,Marbella,Spain
Year and Date
20121007-12
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