PHYS 183 Lecture Notes - Lecture 11: Very-Long-Baseline Interferometry, Radiography, False Color
21 Apr 2018
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Good to have radio telescope on the ground. Hubble telescope in orbit to avoid distortion of the atmosphere. Collect radio waves from stars, nebulae, galaxies. Dishes focus radio waves to antenna: this is the detector of the radio telescope, converts signal to electric current, easily recorded, quantified, etc. The telescope will follow an object in space but generally has its limitations in terms of how far it can travel. Sensitivity is based on diameters squared because it is area. Can do very neat trick with radio telescopes. Can stimulate a really big telescope aperture with several telescopes that are far apart. Total collecting are simply sum of the collecting areas of individual telescopes. But resolution equivalent to having an aperture equal to the largest distance between telescopes. Very large array in soccorro, new mexico: 27 25-m telescoptes. All of these circles (cid:862)add up(cid:863) to make one big telescope.
