National Radio Astronomy Observatory (NRAO) The National Radio Astronomy Observatory (NRAO), headquartered in Charlottesville, Virginia, is a
Federally Funded Research and Development Center (FFRDC) operated by Associated Universities, Inc. under cooperative agreement with the United States
National Science Foundation. NRAO designs, builds, and operates high sensitivity
radio telescopes for use by scientists around the world. NRAO telescopes are open to all astronomers regardless of institutional or national affiliation. Observing time on NRAO telescopes is available on a competitive basis to qualified scientists after evaluation of research proposals on the basis of scientific merit, the capability of the instruments to do the work, and the availability of the telescope during the requested time. NRAO also provides both formal and informal programs in education and public outreach for teachers, students, the general public, and the media. NRAO's facilities are discussed below.
Atacama Large Millimeter/submillimeter Array (ALMA) The
Atacama Large Millimeter/submillimeter Array (ALMA), the world's most advanced millimeter/submillimeter observatory, is located on the Chajnantor plateau of the Chilean Andes near
San Pedro de Atacama, 5000 m above sea level. ALMA was built by an international partnership comprising North America, Europe and East Asia, in cooperation with the Republic of Chile. AUI is the North American Executive for ALMA. ALMA is an international astronomy facility, a single research instrument composed of 66 high-precision antennas which will enable transformational research into the physics of the cold Universe, regions that are optically dark but shine brightly in the millimeter portion of the electromagnetic spectrum. Providing astronomers with a new window on celestial origins, ALMA will probe the first stars and galaxies and directly image the formation of planets. ALMA is funded in East Asia by the National Institutes of Natural Sciences (NINS) of Japan in cooperation with the Academia Sinica (AS) in Taiwan, in Europe by the
European Organisation for Astronomical Research in the Southern Hemisphere (ESO) and in North America by the U.S. National Science Foundation (NSF) in cooperation with the National Research Council of Canada (NRC) and the National Science Council of Taiwan (NSC). ALMA construction and operations are led on behalf of East Asia by the
National Astronomical Observatory of Japan (NAOJ), on behalf of Europe by ESO and on behalf of North America by the National Radio Astronomy Observatory (NRAO), which is managed by Associated Universities, Inc. (AUI).
Very Large Array (VLA)/ Expanded Very Large Array The
Very Large Array (VLA), an array of 27 25-meter antennas, is located on the Plains of San Agustin about 50 miles west of Socorro, New Mexico. Dedicated in 1980, it is an exceedingly powerful scientific instrument that has transformed many areas of astronomy, and has been used by more astronomers and has produced more scientific papers than any other radio telescope in the world. Even after more than a quarter of a century, the VLA exceeds all other radio astronomy facilities with its combination of sensitivity, flexibility, speed, and overall imaging quality. The VLA is currently being rebuilt as a new observatory, the Expanded Very Large Array (EVLA). The EVLA will provide a radio telescope of unprecedented sensitivity, resolution, and imaging capability, by modernizing and extending the existing Very Large Array. When completed, the EVLA will have sensitivity improvements of an order of magnitude, with frequency between 1.0 and 50 GHz, with up to 8 GHz bandwidth per polarization. The modifications are well over 50% complete, and early science with the VLA is expected in 2010.
Central Development Laboratory (CDL) The mission of the CDL, headquartered in Charlottesville, Virginia, is to support the evolution of NRAO's existing facilities and provide the technology and expertise needed to build the next generation of radio astronomy instruments. This is accomplished through development of the enabling technologies: low noise amplifiers, millimeter and sub-millimeter detectors, optics and electromagnetic components including feeds and phased arrays, digital signal processing, and new receiver architectures. CDL staff have developed and produced these critical components and subsystems not only for NRAO's telescopes, but also for the worldwide astronomical community for ground and space-based instruments. Technical innovations developed or enhanced at the CDL have contributed to improvements in communications antennas, transistors, cryogenic coolers, medical and scientific imaging, time and frequency standards, atomic clocks, GPS navigation, 911 emergency call location, and precision spacecraft navigation. NRAO technology increases our understanding of the Universe and contributes to American competitiveness.
The North American ALMA Science Center North American ALMA Science Center in Charlottesville, Virginia, is the ALMA headquarters for North America. The NAASC supports ALMA science operations in Chile and provides user support for the North American community, including user website and proposal guides, proposal preparation, post-observation user support, data reduction "cookbooks," and organization of ALMA meetings/workshops.
Green Bank Observatory (GBO) The
Robert C. Byrd Green Bank Telescope is the world's largest fully steerable radio telescope. The 100-meter Green Bank Telescope (GBT) is located at the
Green Bank Observatory in
Green Bank, West Virginia, which is inside the
National Radio Quiet Zone (NRQZ).
Long Baseline Observatory (LBO) The
Very Long Baseline Array (VLBA) is a continent-wide radio telescope system offering the greatest resolving power of any astronomical instrument operational today. It is a system of ten identical 25-meter radio-telescope antennas, spread from St. Croix in the U.S. Virgin Islands, across the continental United States, to Mauna Kea, Hawaii, working together as a single instrument.
CCAT AUI is helping a university-based team that is building a 6-meter, very wide field of view submillimeter telescope, taking advantage of a superb site adjacent to ALMA, at 5600 meters above sea level in the
Atacama Desert in northern Chile. AUI strongly endorses the science potential of this telescope, currently named CCAT Prime (CCAT-p). AUI obtained the land concession for the site, helped develop the initial road design, and is helping the university group establish its own legal presence in Chile. The goal continues to be the creation of a next-generation submillimeter telescope combining high sensitivity, a wide field of view, and a broad wavelength range to provide an unprecedented capability for deep, large area multicolor submillimeter surveys. ==References==