The Yunnan Observatories (YNAO)’ 40-meter radio telescope participated in the fringe test observation organized by East-Asian very long baseline interferometry (VLBI) Network (EAVN) on November 5, 2019. According to EAVN data processing arrangements, the results were released in late March, 2020.
In this observation, the frequency band was C-band, and the targets were W3OH Masers and 3C84, DA193 continuous spectrum. The total observation time was about one hour.
Besides this 40-meter radio telescope, the stations, the Iriki 20-meter and Ogasawara 20-meter telescopes, in Japan participated in the observation.
According to the results, 40-meter radio telescope of YNAO and the other two stations all have clear fringes and extremely high signal-to-noise ratio.
The success of this observation indicates that the 40-meter radio telescope of YNAO has the ability to participate in EAVN network, and it will do more EAVN observations in the future.
VLBI is a kind of technology that uses multiple telescopes to observe distant objects at the same time, enabling scientists to observe extremely tiny objects. The success of the fringe test means that the telescopes involving can form a VLBI array for observation, which is the key to successful VLBI observation.
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