Results 141 to 150 of about 606 (180)

The Submillimeter Wave Astronomy Satellite: Mission science objectives

Advances in Space Research, 1995
The Submillimeter Wave Astronomy Satellite (SWAS) mission is dedicated to the study of star formation and interstellar chemistry. To carry out this mission, SWAS will survey dense (nH2 > 103 cm−3) molecular clouds within our galaxy in either the ground-state or a low-lying transition of five astrophysically important species: H2O, H218O, O2, CI, and
Melnick, GJ, Dalgarno, A, Erickson, NR, Fazio, GG, Goldsmith, PF, Harwit, M, Hollenbach, DJ, Koch, DG, Neufeld, DA, Schieder, R, Snell, RL, Stauffer, JR, Thaddeus, P, Tolls, V, Winnewisser, GF   +14 more
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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 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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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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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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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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Coherent Detector Arrays for Millimeter and Submillimeter Astronomy

2009
Progress in many areas of astronomy requires large-area surveys and observations of extended objects. This includes the cosmic microwave background, nearby galaxies, the Milky Way, and regions of star-forming regions within our galaxy. The ability to carry out such studies is critically dependent on the development of affordable high-sensitivity focal ...
Goldsmith, Paul F., Carpenter, John M., Erickson, Neal, Fisher, Rick, Ford, John, Todd, Gaier, Groppi, Chris, Harris, Andy, Mark, Heyer, Kulesa, Craig, Lawrence, Charles, Morgan, Matt, Mundy, Lee, Narayanan, Gopal, O'Neil, Karen, Readhead, Tony, Samoska, Lorene, Schloerb, Peter, Snell, Ronald, Walker, Christopher C., Ziurys, Lucy   +20 more
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