Radio Astronomy , NRAO & the VLA ?· Universities Inc. to develop a National Radio Astronomy Observatory…
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Atacama Large Millimeter/submillimeter Array Karl G. Jansky Very Large Array Robert C. Byrd Green Bank Telescope Very Long Baseline Array Radio Astronomy, NRAO & the VLA T. Beasley NRAO History Radio astronomy is a subfield of astronomy that studies celestial objects at radio frequencies 1874 Maxwells equations light had components invisible to the eye 1889 radio experiments 1890-1900s early experiments.. No detections of radio waves from the sky 1902 prediction that nothing would be seen 1930s transatlantic radio phone calls additional noise 1932 Bell Labs Karl Jansky Intro 2 Intro 3 Intro 4 WWII significant funding into radio/radar technologies Post WWII Australians, English, Dutch move expertise into radio astronomy Post WWII US NSF Mid 1950s major facility required contract with Associated Universities Inc. to develop a National Radio Astronomy Observatory Single-dish telescopes. US begins in Green Bank, WV Intro 5 Intro 6 Singe Dishes Arrays of dishes Resolution depends on size of dish D (weight goes a D3) Arrays of dishes, returning signals which are processed into images Early arrays in Australia, UK, Netherlands Late 60s Very Large Array 1972 August: approved by Congress 1973 April: construction started 1975 September 22: first antenna put in place 1976 February 18: first fringes 1980: formal dedication of the VLA VLA today preeminent cm radio telescope in the world Intro 7 Intro 8 Intro 9 Intro 10 Intro 11 Tour: avoid snakes and the Sun. 7000 Intro 12 Very Large Array Very Long Baseline Array Atacama Large Millimeter/submm Array Green Bank Telescope NRAO/AUI Today + HQ, Central Development Laboratory (CV) + AUI Corporate (DC) Intro 13 ATACAMA LARGE MILLIMTER ARRAY: ALMA Intro 14 Terminator Salvation Intro 15 The National Radio Astronomy Observatory is a facility of the National Science Foundation operated under cooperative agreement by Associated Universities, Inc www.nrao.edu Radio Astronomy, NRAO & the VLAHistorySlide Number 3Slide Number 4Slide Number 5Slide Number 6Singe Dishes Arrays of dishesSlide Number 8Slide Number 9Slide Number 10Slide Number 11Slide Number 12Slide Number 13Slide Number 14Slide Number 15
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