Results 141 to 150 of about 569 (189)

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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Submillimeter Wave Astronomy Satellite (SWAS) acousto-optical spectrometer

SPIE Proceedings, 1994
The first fully space qualified acousto-optical spectrometer (AOS) is described. It is built for the Submillimeter Wave Astronomy Satellite (SWAS) to be launched in July 1995. It has a very large bandwidth from 1400 to 2800 MHz covered by 1365 channels. This corresponds to a nearly 1 MHz channel spacing. The design is optimized for very high stability,
Markus Klumb, Johannes Frerick, Volker Tolls, Rudolf T. Schieder, Gisbert F. Winnewisser   +4 more
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Optimal Design of Optics for Submillimeter Astronomy (Letters)

IEEE Transactions on Microwave Theory and Techniques, 1974
We have designed two- and three-element shaped reflecting telescopes which minimize diffraction losses and sidelobes for submillimeter radiometric and spectrometric application. New solutions for the near-field output of an off-axis paraboloid when illuminated with a beam of considerable power taper (20 dB) show the merit of using Gaussian illumination
J.E. Beckman, J.A. Shaw
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Molecular Astronomy at Submillimeter Wavelengths

1984
The difficulties of making astronomical observations in the submillimeter spectrum are described in detail. Receiver technology and atmospheric absorption provide the biggest challenge. Techniques of overcoming these problems are discussed and some initial astronomical results are illustrated.
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Radar astronomy at millimeter and submillimeter wavelengths

Proceedings of the IEEE, 1966
The scant two-decade existence of radar astronomy has seen important contributions by this new technique to positional astronomy, to the metrics of the solar system, and to the study of lunar and planetary surfaces. The role of millimeter wavelengths in this new astronomy is discussed and the problems unique to these short wavelengths defined.
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