Honma M., Hirota T., Oyama T., Nakagawa A. . VERA’s 20 yr Evolution in Science and Technology . Galaxies13 ( 6 ) 2025年12月 詳細を見る 記述言語： 日本語 出2025 · 記述言語： 日本語 出版者・発行元： Galaxies We review the past 20 yr evolution of VERA (VLBI Exploration of Radio Astrometry) in both science and techinology. VERA is a VLBI array in Japan which consists of four 20 m-diameter telescopes, originally dedicated to phase-referencing VLBI astrometry. Its main observing bands are K (22 GHz) and Q (43 GHz) for conducting astrometry observations of H<inf>2</inf>O and SiO maser sources. In its 20 yr history, VERA has conducted astrometry observations of ∼100 maser sources, revealing the three-dimensional structure of the Milky Way Galaxy. Its long-term observations of Sgr A* resulted in the first parallax detection of the super-massive black hole at the Galaxy center. Observations of maser sources also revealed physical properties of star-forming regions and provided calibration of AGB stars’ distances and their Period–Luminosity relation. In parallel, several upgrades have been carried out in receivers as well as digital back-ends and correlator to extend the frequency bands and the data rate. DOI： 10.3390/galaxies13060120 Scopus
