Indirect measurement of the Hubble Constant through stereoscopic gamma-ray observations with CTA-LST and MAGIC

通过 CTA-LST 和 MAGIC 立体伽马射线观测间接测量哈勃常数

• 批准号: 22H01226
• 负责人: Mazin Daniel
• 金额: $ 9.98万
• 依托单位: The University of Tokyo
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2022
• 资助国家: 日本
• 起止时间: 2022-04-01 至 2025-03-31
• 项目状态: 未结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-22H01226/
• 关键词: gamma-ray; Cherenkov; Hubble Constant; gamma-rays; Cherenkov telescopes; hardware trigger; H0 constant; EBL; IACT; Trigger; Hubble constant; gamma rays

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.

已安装和验证了立体声硬件扳机。尤其是，我们在LST摄像头和Magic Counting House之间购买并部署了一条新的触发电缆，与以前的安装相比，触发器旅行时间缩短了约500ns。这对于交付LST扳机以及时与魔术望远镜建立巧合触发非常重要，因为魔术望远镜具有相对较短的模拟缓冲区长度。我们还在魔术触发系统中安装了一个新的固件，并开发了软件代码，以控制和监视LST和魔术望远镜之间的Zenith和方位角触发延迟。触发时机已经进行了调整，并在硬件立体声模式下进行了几个测试数据集。常数H0。