Millimeter-Wavelength Very Long Baseline Interferometry is interferometry at millimeter wavelengths
(3.5-1.3mm: 86GHz-230GHz) with disconnected
telescopes using the longest baselines on Earth
(1000-10000km) in order to achieve the highest angular
resolution (0.01 - 0.00005). The disconnected telescopes need
special time/frequency references provided by the observatory-own
Hydrogen-masers, synchronized to GPS time signals. The
observations are recorded on tape for correlation at special
correlator stations. The correlation gives visibility tables.
mm-VLBI sees only sources which emit non-thermal radiation at
brightness temperatures of T
10
-10
K. These sources represent the 'hot' and
energetic component of the Universe, for instance masers and
quasars.