| Project/Area Number |
23K22497
|
|---|
| Project/Area Number (Other) |
22H01226 (2022-2023)
|
|---|
| Research Category |
Grant-in-Aid for Scientific Research (B)
|
| Allocation Type | Multi-year Fund (2024)
Single-year Grants (2022-2023) |
|---|
| Section | 一般 |
|---|
| Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
|
|---|
| Research Institution | The University of Tokyo |
|---|
Principal Investigator |
Mazin Daniel 東京大学, 宇宙線研究所, 特任教授 (90747990)
|
|---|
| Co-Investigator(Kenkyū-buntansha) |
Vovk Ievgen 東京大学, 宇宙線研究所, 助教 (20899405)
手嶋 政廣 東京大学, 宇宙線研究所, グローバルフェロー (40197778)
齋藤 隆之 東京大学, 宇宙線研究所, 助教 (60713419)
高橋 光成 名古屋大学, 宇宙地球環境研究所, 特任助教 (60838960)
|
|---|
| Project Period (FY) |
2022-04-01 – 2025-03-31
|
| Project Status |
Granted (Fiscal Year 2024)
|
| Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
Fiscal Year 2024: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Fiscal Year 2023: ¥5,850,000 (Direct Cost: ¥4,500,000、Indirect Cost: ¥1,350,000)
Fiscal Year 2022: ¥7,020,000 (Direct Cost: ¥5,400,000、Indirect Cost: ¥1,620,000)
|
|---|
| Keywords | Hubble constant / Cherenkov telescopes / Hardware stereo trigger / gamma-rays / trigger system / EBL / Hubble Constant / gamma-ray / Cherenkov / hardware trigger / H0 constant / IACT / Trigger / gamma rays |
|---|
| Outline of Research at the Start |
We will take data on flaring AGNs and GRBs with the new trigger system. We will analyse joint CTA-LST and MAGIC data and derive constraints on the extragalactic background light as well as the Hubble Constant H0. We also look into a new technology of Hollow Core Fibers to improve the trigger system.
|
| Outline of Annual Research Achievements |
In FY2023 the hardware stereo trigger has been commissioned and first gamma-ray flux sensitivity results have been obtained. Taking joint LST1-MAGIC data with the hardware stereo trigger proved to collect about 100% more gamma rays than with the LST1 and MAGIC run separately, due to addition of the LST1-MAGIC1 and LST1-MAGIC2 events, which did not trigger the third telescope. The additional events recorded with the hardware stereo triggers are, as expected, clustered at low gamma-ray energies, which is in particular use for distant sources, like AGNs and GRBs. The improved sensitivity has been shown at the JPS meeting in Spring FY2023. Data on Crab nebula and Mrk421 has been collected. On theoretical side, a methodology has been prepared to derive Hubble Constant H0 from gamma-ray data.
|
| Current Status of Research Progress |
Current Status of Research Progress
2: Research has progressed on the whole more than it was originally planned.
Reason
The progress is smooth. The hardware part is finished but some drawbacks have been recognized. 1. Only 50% of the sky is accessible with the newly developed hardware stereo trigger for LST1 and MAGIC telescopes. This makes it more difficult to obtain a sufficient amount of data needed to constrain the extragalactic background light and to determine the Hubble Constant H0.
2. The usage of the hardware is not automatic, MAGIC telescope operators have to be instructed to use it every time. This reduces the amount of data taken.
On the theoretical side, the methodology to constrain the EBL and the Hubble Constant H0 is in place and waits for gamma-ray data to be applied to.
|
| Strategy for Future Research Activity |
in FY2024 automation of the usage of the hardware stereo trigger should be implemented to increase the amount of data taken. Also analysis tools of this type of joint LST1-MAGIC data has to be improved (which goes beyond the scope of this grant). We are also investigating a possibility of using a hollow fiber, which is a new technology promising to save some 200ns in propagation of the trigger signal from LST1 to MAGIC, which in turn would open the accessible sky porting from currently 50% to 90%. Finally, we are hoping to obtain data on flares from AGN and close-by GRBs to produce and publish results on EBL and Hubble Constant H0.
|
