The very long baseline interferometry (VLBI) technique offers angular resolutions superior to any other instruments at other wavelengths, enabling unique science applications of high-resolution imaging of radio sources and high-precision astrometry. The East Asian VLBI Network (EAVN) is a collaborative effort in the East Asian region.
The EAVN currently consists of 21 telescopes with diverse equipment configurations and frequency setups, allowing flexible subarrays for specific science projects. The EAVN provides the highest resolution of 0.5 mas at 22 GHz, allowing the fine imaging of jets in active galactic nuclei, high-accuracy astrometry of masers and pulsars, and precise spacecraft positioning. The soon-to-be-operational Five-hundredmeter Aperture Spherical radio Telescope (FAST) will open a new era for the EAVN.
This state-of-the-art VLBI array also provides easy access to and crucial training for the burgeoning Asian astronomical community.
Location of EAVN sites, including the Korea-Japan Correlation Center at KASI (Korea) and Mizusawa VLBI observatory (NAOJ, Japan), overlaid on 'the Blue Marble' image (credit of the ground image: NASA's Earth Observatory). Kunming 40-m telescope newly participates in the EAVN open use from the 2021B semester.