Coauthors: Shimano Masahiro (Rikkyo Niiza High School) , Ueda Kento (Shizuoka University) , Takeo Mochizuki (Shizuoka University)

We developed educational materials using Suzaku X-ray satellite data to verify the Hubble–Lemaître law and determine the Hubble time (the approximate age of the universe). Suzaku data are easily analyzed via UDON2, a web-based tool by ISAS/JAXA C-SODA. We selected 14 galaxy clusters and galaxies with distances known via non-redshift methods that exhibit strong highly ionized iron lines. Measuring central line energy from X-ray spectra using UDON2, we calculated recession velocity via the Doppler formula, yielding a Hubble time of ~13 billion years. These materials enable high school students to learn the Doppler effect, electromagnetic waves, photons, and atomic spectra. We report their practical application in a physics class focused on "The Beginning of the Universe."

Biography:

Hideki Uchiyama is an X-ray astronomer who graduated from Kyoto University with a B.S. in 2005, an M.S. in 2007, and a Ph.D. in 2010. He participated in the Suzaku (ASTRO-E2) and Hitomi (ASTRO-H) missions and is currently working on the XRISM mission. His main research interest is the Milky Way Galaxy, especially the high-energy activity in its central region. He teaches at the Faculty of Education, Shizuoka University, and has recently been involved in science education using (small) satellites.