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Abstract
The Event Horizon Telescope (EHT) 2017 campaign successfully imaged the black hole shadow for the first time. To achieve this image, we used the very long baseline interferometry (VLBI) technique at the wavelength of 1.3 mm (frequency of 230 GHz) with utilizing eight millimeter- and submillimeter-wavelength telscopes all over the world. For the interferometry, the distance between two telescopes (i.e., baseline length) decides the angular resolution. The EHT telescopes extends near the diameter of the Earth, so together with the short wavelength, it is possible to reach the angular resolution of about 25 micro-arcsec. This resolution is sufficient to image the shadows of nearby supermassive black holes (SMBHs), and indeed, we have succeessfully imaged the shadow of the SMBH at the center of the nearby giant elliptical galaxy M87. In this talk, I will give an overview of the technologies we have used in the EHT 2017 campaign, and also present the plans of the future development.
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