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.

立体声硬件触发器已安装并验证。特别是，我们在 LST 摄像机和 MAGIC 计数室之间购买并部署了一条新的触发电缆，与之前的安装相比，将触发行程时间缩短了约 500ns。这对于及时传送 LST 触发以与 MAGIC 望远镜建立重合触发非常重要，因为 MAGIC 望远镜的模拟缓冲区长度相对较短。我们还在 MAGIC 触发系统中安装了新固件，并开发了软件代码来控制和监控 LST 和 MAGIC 望远镜之间的天顶角和方位角相关触发延迟。调整了触发时序，并在硬件立体模式下获取了多个测试数据集。同时完成了河外背景光密度约束的方法推导工作，可直接用于约束哈勃常数H0。