Concept for a second Giant Magellan Telescope (GMT) in Antarctica
While definitive winter measurements for Dome C must await until 2004, on the basis of existing data the Antarctic Dome sites promise the best conditions on the Earth for many astronomical observations. Because atmospheric turbulence is largely confined to a ~ 100 m ground layer, adaptive correction...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.71.5880 2023-05-15T13:57:37+02:00 Concept for a second Giant Magellan Telescope (GMT) in Antarctica Roger Angel A Jon Lawrence B John Storey B The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.71.5880 http://www.phys.unsw.edu.au/~mgb/Antbib/Angel_GMTpaper.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.71.5880 http://www.phys.unsw.edu.au/~mgb/Antbib/Angel_GMTpaper.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.phys.unsw.edu.au/~mgb/Antbib/Angel_GMTpaper.pdf text ftciteseerx 2016-01-08T18:54:45Z While definitive winter measurements for Dome C must await until 2004, on the basis of existing data the Antarctic Dome sites promise the best conditions on the Earth for many astronomical observations. Because atmospheric turbulence is largely confined to a ~ 100 m ground layer, adaptive correction with a single deformable mirror conjugated to this layer should yield an 8-arcminute field of view with 0.1 arcsec images at optical wavelengths. The ground layer wavefront aberration can likely be sensed with natural guide stars found over the wide field. In the infrared there is the added advantage of low thermal background from the cold atmosphere and telescope optics, as much as 50x reduction in the 3.5 µm L band. An ELT that fully exploited these advantages would provide a uniquely powerful ground-based complement to the James Webb Space Telescope, especially for spectroscopy. We consider here the concept of building a copy of the 21 m Giant Magellan telescope (GMT) telescope (Johns, 2003) at Dome C. The optical design is ideal, with a very fast (f/0.7) primary mirror and direct Gregorian focus formed by a deformable secondary conjugated to the ground layer. In the thermal infrared, diffraction-limited images are produced with the low background of only two warm mirrors, the primary and secondary. There are also practical advantages. The enclosure is of modest size, by ELT standards, because the primary is very fast. Assembly, debugging and maintenance problems on-site are minimized by a primary mirror built from a small number of large, pre-tested Text Antarc* Antarctic Antarctica Unknown Antarctic The Antarctic Webb ENVELOPE(146.867,146.867,-67.867,-67.867) |
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English |
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While definitive winter measurements for Dome C must await until 2004, on the basis of existing data the Antarctic Dome sites promise the best conditions on the Earth for many astronomical observations. Because atmospheric turbulence is largely confined to a ~ 100 m ground layer, adaptive correction with a single deformable mirror conjugated to this layer should yield an 8-arcminute field of view with 0.1 arcsec images at optical wavelengths. The ground layer wavefront aberration can likely be sensed with natural guide stars found over the wide field. In the infrared there is the added advantage of low thermal background from the cold atmosphere and telescope optics, as much as 50x reduction in the 3.5 µm L band. An ELT that fully exploited these advantages would provide a uniquely powerful ground-based complement to the James Webb Space Telescope, especially for spectroscopy. We consider here the concept of building a copy of the 21 m Giant Magellan telescope (GMT) telescope (Johns, 2003) at Dome C. The optical design is ideal, with a very fast (f/0.7) primary mirror and direct Gregorian focus formed by a deformable secondary conjugated to the ground layer. In the thermal infrared, diffraction-limited images are produced with the low background of only two warm mirrors, the primary and secondary. There are also practical advantages. The enclosure is of modest size, by ELT standards, because the primary is very fast. Assembly, debugging and maintenance problems on-site are minimized by a primary mirror built from a small number of large, pre-tested |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Roger Angel A Jon Lawrence B John Storey B |
spellingShingle |
Roger Angel A Jon Lawrence B John Storey B Concept for a second Giant Magellan Telescope (GMT) in Antarctica |
author_facet |
Roger Angel A Jon Lawrence B John Storey B |
author_sort |
Roger Angel A |
title |
Concept for a second Giant Magellan Telescope (GMT) in Antarctica |
title_short |
Concept for a second Giant Magellan Telescope (GMT) in Antarctica |
title_full |
Concept for a second Giant Magellan Telescope (GMT) in Antarctica |
title_fullStr |
Concept for a second Giant Magellan Telescope (GMT) in Antarctica |
title_full_unstemmed |
Concept for a second Giant Magellan Telescope (GMT) in Antarctica |
title_sort |
concept for a second giant magellan telescope (gmt) in antarctica |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.71.5880 http://www.phys.unsw.edu.au/~mgb/Antbib/Angel_GMTpaper.pdf |
long_lat |
ENVELOPE(146.867,146.867,-67.867,-67.867) |
geographic |
Antarctic The Antarctic Webb |
geographic_facet |
Antarctic The Antarctic Webb |
genre |
Antarc* Antarctic Antarctica |
genre_facet |
Antarc* Antarctic Antarctica |
op_source |
http://www.phys.unsw.edu.au/~mgb/Antbib/Angel_GMTpaper.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.71.5880 http://www.phys.unsw.edu.au/~mgb/Antbib/Angel_GMTpaper.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766265348221304832 |