Results 201 to 210 of about 301,318 (244)

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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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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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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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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Submillimeter Heterodyne Astronomy from Mauna Kea

1981 International Conference on Submillimeter Waves and Their Applications, 1981
This paper reports on the results of a collaboration between NASA Goddard Space Flight Center and MIT Lincoln Laboratory in which a laser heterodyne receiver was developed and used at the NASA infrared telescope on Mauna Kea. The NASA IRTF is located on the island of Hawaii at an elevation of 14000 ft (4200 m).
D. Buhl, G. Chin, H. R. Fetterman, D. D. Peck, B. J. Clifton, P. E. Tannenwald, G. A. Koepf   +6 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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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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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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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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