Results 171 to 180 of about 20,687 (218)

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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Millimeter and submillimeter wave astronomy

Annual Meeting Optical Society of America, 1986
The interstellar medium consists of diffuse clouds and dense clouds containing atoms, molecules, and dust particles at temperatures ranging from 3 to several hundred kelvins. The dense cloud gas particles are mostly molecular and the species found vary from simple molecules such as H2, CO, CS, HCN, etc.
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Techniques of Submillimeter Astronomy

1988
This review discusses the relative merits of direct and heterodyne techniques for detection in the submillimeter band. A variety of astronomical observing conditions is examined, including those for mountain-top and space telescopes. The spectral resolution (Δν/ν) of the observation is shown to be an important factor in the decision between direct and ...
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Submillimeter Astronomy Reaches New Heights

Science, 1999
LLANO DE CHAJNANTOR, CHILE-- High in the Chilean Andes, over 5000 meters above sea level, astronomers are planning the world9s loftiest observatory: a 10-kilometer-wide array of dishes to peer into the universe9s cold recesses and open a sharp eye on celestial features ranging from surface markings on Pluto to extrasolar planets to the dusty ...
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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.
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Submillimeter and Far-Infrared Observing Platforms for Astronomy

2001
During the next decade several airborne and space-borne platforms for far-infrared and submillimeter astronomy and spectroscopy will become operational These observatories will provide sensitivity and spatial resolution several times better than previous missions.
Hübers, H.-W., Röser, H. P.
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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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Cryogenic metal mesh bandpass filters for submillimeter astronomy

Applied Optics, 1984
The design and performance of a tunable double-half-wave bandpass filter centered at 286 microns (Delta lambda/lambda = 0.16) and operating at cryogenic temperatures (for astronomy applications) are presented. The operating principle is explained, and the fabrication of the device, which comprises two identical mutually coupled Fabry-Perot filters with
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FIR lasers as local oscillators in submillimeter astronomy

SPIE Proceedings, 1991
ABSTRACT Optically pumped molecular lasers have been developed for high resolution spectroscopy in the wavelength range from 100 to 500pm with a resolving power of>106. With more than 1,000 discrete laser lines they cover the whole spectral range and offer high cw output power up to 50mW, good signal to noise ratio and high spectral purity. This paper •
Hans-Peter Roeser, Peter Van der Wal
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Submillimeter Wave Astronomy Satellite and Star Formation

2003
As a successful NASA explorer mission, SWAS makes first detections of the H2O emission at a ground-state transition (110 → 101). The general range of the fractional water abundance ([H2O] /[H2] 6×10-10 3 × 10-8), established through SWAS observations, are lower than those predicted by pure gas-phase chemistry by two orders of magnitude.
Di Li, Gary J. Melnick
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