Results 131 to 140 of about 606 (180)

Submillimeter astronomy (heterodyne spectroscopy)

Proceedings of the IEEE, 1992
Some of the aspects of submillimeter-wave astronomy which are relevant to the field of heterodyne spectroscopy are reviewed. Most of the discussion concerns the dense interstellar medium where stars are forming, with some work presented on nearby galaxies.
T G Phillips, J Keene
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Submillimeter receivers for radio astronomy

Proceedings of the IEEE, 1992
The state of development of receivers for submillimeter-wave radio astronomy is reviewed. Bolometers for continuum observation, hot-electron mixer receivers for narrowband spectral line observation, and heterodyne receivers, both Schottky diode and superconducting tunnel junction, are presented.
R Blundell, C -Y E Tong
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Contemporary Millimeter- and Submillimeter-Wave Astronomy

Radiophysics and Quantum Electronics, 2003
We discuss the scientific importance of the millimeter- and submillimeter-wave astronomy. The directions of research and the main achievements in cosmology, extragalactic astronomy, and studies of the Galaxy structure, star-formation regions, and Solar-System objects are described. Topical problems are formulated.
Igor Zinchenko
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On the future of submillimeter astronomy at the South Pole

AIP Conference Proceedings, 1990
The South Pole is the best accessible submillimeter‐wave observatory site in the world. The Antarctic Submillimeter Telescope/Remote Observatory (AST/RO), a 1.5 m offset telescope for heterodyne spectroscopy, will be a step toward a permanent submillimeter observatory there.
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Submillimeter Astronomy and Mauna Kea - An Overview

IEEE MTT-S International Microwave Symposium Digest IEEE MTT-S International Microwave Symposium, 2007
Astronomy in the submillimeter region of the electromagnetic spectrum, covering wavelengths between 1 mm and 0.1 mm, is now just past its 30th anniversary. During this period there has been enormous progress in technology for detecting and analyzing signals. This has led to discovery of astronomical sources not even considered when observations in this
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Submillimeter wave astronomy satellite science highlights

Advances in Space Research, 2004
Since its launch on 5 December 1998, the Submillimeter Wave Astronomy Satellite (SWAS) has surveyed more than 5000 lines-of-sight toward more than 200 Galactic objects in transitions of five astrophysically important atomic and molecular species: H216O, H218O, O2, CI, and 13CO.
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Submillimeter Wave Astronomy Satellite

SPIE Proceedings, 1994
The Submillimeter Wave Astronomy Satellite (SWAS) mission will study galactic star formation and interstellar chemistry. To carry out this mission, SWAS will survey dense (n H2 > 10 3 cm -3 ) molecular clouds within our galaxy in either the ground-state or a low- lying transition of five astrophysically important species: H 2 O, H 2 18 O, O 2 , CI ...
Volker Tolls, Gary J. Melnick, Alexander Dalgarno, Giovanni G. Fazio, John R. Stauffer, Patrick Thaddeus, Neal R. Erickson, Ron L. Snell, Paul F. Goldsmith, Martin Harwit, David J. Hollenbach, David G. Koch, David A. Neufeld, Rudolf T. Schieder, Gisbert F. Winnewisser   +14 more
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Submillimeter astronomy and developments in China

2014 XXXIth URSI General Assembly and Scientific Symposium (URSI GASS), 2014
Millimeter to submillimeter radio astronomy is one of the frontier areas in Chinese astronomy. The major research activities include molecular clouds, star formation, formation and evolutions of galaxies. Purple Mountain Observatory (PMO) is the major institute in China responsible for mm/submm astronomy and developments.
Sheng-Cai Shi, Ji Yang
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Low-pass interference filters for submillimeter astronomy

Applied Optics, 1980
Low-pass (long-wave transmitting) interference filters, suitable for broadband photometric observations, previously have been constructed from series of capacitive grids stretched on thin Mylar. These filters have the desired optical properties of high transmission, sharp cut-ons, and good blocking at short wavelengths.
S E, Whitcomb, J, Keene
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Submillimeter astronomy and cosmology

Space technology and applications international forum (STAIF - 97), 1997
In this paper I summarize some key astrophysics questions and the future space missions needed to address them. These missions, and the questions that drive them, fall under the aegis of two of the four thematic areas of NASA’s Office of Space Science: “The Astronomical Search for Origins and Planetary Systems” covers astrophysics in the near-infrared,
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