2001 Fiscal Year Final Research Report Summary
SEARCH FOR VERY HIGH ENERGY GAMMA-RAYS FROMACTIVE GALACTIC NUCLEI
| Project/Area Number |
12640292
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
素粒子・核・宇宙線
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| Research Institution | TOKAI UNIVERSITY |
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Principal Investigator |
NISHIJIMA Kyoshi TOKAI UNIVERSITY, PHYSICS, ASSOCIATE PROFESSOR, 理学部, 助教授 (40202238)
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| Project Period (FY) |
2000 – 2001
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| Keywords | gamma-rays / active galactic nuclei / air Cherenkov telescope / CANGAROO / PKS2005-49 / PKS2155-304 / Mrk421 / extragalactic infrared photon |
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| Research Abstract |
Observation of AGNs : I have observed four AGNs in the energy range above several hundred GeV using CANGAROO-II 10 m telescope. For PKS2155-304, observation has been done for about 36 hours for on-source scan and about 35 hours for off-source scan including participation in the mulriwave length campaign. I have seen no evidence for persistent gamma-ray emission from PKS2155-304. Flux upper limits(2δ)is obtained to be 1.2×10^<-11>cm^<-2> sec^<-1> for above 400GeV.PKS2005-489 was observed for 33 hours for on-source scan and 31 hours for off-source scan. RXTE observation were carried out for 15 days during my observation periods in 2000. I have seen no evidence for persistent gamma-ray emission from PKS2005-489. Flux upper limit(2δ) obtained for above 450 GeV is 6.4×10^<-12> cm^<-2> sec^<-1>. During my observation periods, both targets remained in a low level state. We observed Mrk421 for ten nights during its active state in early 2001 using the very large zenith angle technique. The result shows the detection of gamma-rays from Mrk421 in the energy range above 10 TeV. Considering the absorption by extragalactic infrared photons, this implies that the energy spectrum in a high level state is very hard.
Development of trigger module : In order to lower the energy threshold, I studied the trigger condition by the Monte Carlo simulation, and I found clustering trigger is very effective. Then I develop the intelligent trigger module using complimentary programmable logic device to realize the clustering trigger.
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