Indirect measurement of the Hubble Constant through stereoscopic gamma-ray observations with CTA-LST and MAGIC
Project/Area Number |
22H01226
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Research Category |
Grant-in-Aid for Scientific Research (B)
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Allocation Type | Single-year Grants |
Section | 一般 |
Review Section |
Basic Section 15020:Experimental studies related to particle-, nuclear-, cosmic ray and astro-physics
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Research Institution | The University of Tokyo |
Principal Investigator |
Mazin Daniel 東京大学, 宇宙線研究所, 特任准教授 (90747990)
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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)
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Project Period (FY) |
2022-04-01 – 2025-03-31
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Project Status |
Granted (Fiscal Year 2023)
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Budget Amount *help |
¥15,600,000 (Direct Cost: ¥12,000,000、Indirect Cost: ¥3,600,000)
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)
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Keywords | gamma-ray / Cherenkov / Hubble Constant / gamma-rays / Cherenkov telescopes / hardware trigger / H0 constant / EBL / IACT / Trigger / Hubble constant / gamma rays |
Outline of Research at the Start |
本研究の目的は、活動銀河核やガンマ線バーストなどの遠方のガンマ線源を観測し、それらの放射機構を解明し、さらにハッブル定数H0を決定することである。H0は遠方天体のスペクトラムに現れる、銀河外背景夜光によるガンマ線の吸収の痕跡から求めることができる。この手法は、Ia型超新星爆発 や宇宙背景マイクロ波を利用するH0測定手法とは完全に相補的である。この目的を達成するため、現行の大気チェレンコフ望遠鏡MAGIC(二台)と、CTAーLST初号機とのステレオトリガーシステムを開発、実装する。この3台のステレオ観測により、感度は約二倍向上し、エネルギー閾値も30%下がり、H0測定の精度を大きくあげる。
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Outline of Annual Research Achievements |
The stereo hardware trigger has been installed and validated. In particular, we purchased and deployed a new trigger cable between the LST camera and MAGIC counting house shortening the trigger travel time by about 500ns compared to the previous installation. This is important to deliver the LST trigger in time to build a coincidence trigger with the MAGIC telescopes because MAGIC telescopes have a relatively short analog buffer length. We also installed a new firmware in MAGIC trigger system and developed the software code to control and monitor zenith and azimuth dependent trigger delays between LST and MAGIC telescopes. The trigger timing has been adjusted and several test data sets has been taken in hardware stereo mode. In the same time work on methodology to derive constraints on the density of the Extragalactic Background Light has been done, which can be directly used to constrain the Hubble constant H0.
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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 of the project is within the schedule. The hardware part of the project has been designed, deployed and commissioned. The evaluation of the performance is ongoing.
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Strategy for Future Research Activity |
In FY2023 we will study the actual performance and take data on various gamma-ray sources. We expect several trips to La Palma to polish the performance of the trigger and make it to a standard trigger system between LST1 and MAGIC telescopes. We also expect to take first data with hardware stereo trigger on extragalactic sources to derive preliminary limits on the H0 constant.
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Report
(1 results)
Research Products
(2 results)