Molonglo Observatory Synthesis Telescope

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The Molonglo Observatory Synthesis Telescope (MOST) is a radio telescope operating at 843 MHz. It is operated by the School of Physics of the University of Sydney.The telescope is located near the Molonglo River near Canberra, Australian Capital Territory, and was constructed by modification of the East-West arm of the former Molonglo Cross Telescope, a larger version of the Mills Cross Telescope.
The MOST consists of two cylindrical paraboloids, 778m x 12m, separated by 15m and aligned East-West. A line feed system of 7744 circular dipoles collects the signal and feeds 176 preamplifiers and 88 IF amplifiers.
The telescope is steered by mechanical rotation of the cylindrical paraboloids about their long axis, and by phasing the feed elements along the arms. The resulting `alt-alt’ system can follow a field for +/- 6 hours (necessary for a complete aperture synthesis with an East-West array) only if the field is south of declination -30 degrees. For fields near this limit the signal-to-noise ratio is lower for the first and last hour or so due to the lower gain of the system at large ‘meridian arc distance’ angles.
Much pioneering radio astronomy was done with this telescope. The Molonogo Cross Telescope was used for a survey of the Southern sky with a resolution of 2.8 arc-min.
The telescope’s main research project was the Sydney University Molonglo Sky Survey (SUMSS), a sensitive radio imaging survey of the southern sky at 843 MHz with similar resolution and sensitivity to the northern NRAO VLA Sky Survey (NVSS). SUMSS is now complete, and digital images and a source catalogue are available online.

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