Results 251 to 260 of about 38,151 (299)

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.
openaire   +1 more source

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.
openaire   +1 more source

ALMA and Sub-millimeter-wave Astronomy

2006 Joint 31st International Conference on Infrared Millimeter Waves and 14th International Conference on Teraherz Electronics, 2006
The Atacama Large Millimeter/submillimeter Array (ALMA) will be the premier millimeter and submillimeter telescope in the world when completed in 2012. ALMA will be a transformational telescope that allows astronomers to image and study at unprecedented detail the origin of stars and planets, galaxies and biologically relevant chemistry, fundamental ...
openaire   +1 more source

A 0.4K Bolometer Receiver for Millimeter Astronomy

1981 International Conference on Submillimeter Waves and Their Applications, 1981
Engineering tests have been made of a continuum receiver based upon a composite bolometer cooled to 0.4K on the NRAO 36-foot telescope. We will describe some salient features of the receiver design and also discuss the relative sensitivity of this receiver compared to current coherent continuum receivers.
P. Ade, J. Davis, R. Howard, I. Nolt, J. Payne, S. Predko, J. Radostitz   +6 more
openaire   +1 more source

Molecular Millimeter Wave Astronomy (Short Papers)

IEEE Transactions on Microwave Theory and Techniques, 1974
Molecular millimeter wave astronomy is briefly reviewed. Particular emphasis is placed on the newer areas of research in astronomy and astrophysics which have been facilitated by radio observations of galactic molecules in the millimeter wavelength range of the spectrum.
openaire   +1 more source

Multibeam receiver for millimeter-wave radio astronomy

Review of Scientific Instruments, 1988
An eight-beam receiver system for millimeter-wave radio astronomy is described. The receiver is designed to map spatially extended radio sources in both spectral line and continuum emission at a wavelength of 1.2 mm. This receiver is now in use on the 12-m radio telescope on Kitt Peak in Arizona.
openaire   +1 more source

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.
openaire   +1 more source

Switching subreflector for millimeter wave radio astronomy

Review of Scientific Instruments, 1976
A method of beam switching a Cassegrain antenna used for radio astronomy by tilting the hyperbolic secondary reflector is described. The system described has been in use for over a year at the 11-m millimeter wave antenna operated by the National Radio Astronomy Observatory at Kitt Peak, Arizona.
openaire   +1 more source

Atacama Large Millimeter Array Local Oscillator: How Photonics is Enabling Millimeter-wave Astronomy

Optical Fiber Communication Conference/National Fiber Optic Engineers Conference 2011, 2011
In this talk we will describe the unique photonic technology that provides the reference for the local oscillator system of the ALMA millimeter wave radio telescope as well as describing the “down-stream” part of the local oscillator system.
D. L. “Skip” Thacker, Bill Shillue
openaire   +1 more source

Focal plane arrays for millimeter-wavelength astronomy

1992 IEEE Microwave Symposium Digest MTT-S, 2003
Some of the general characteristics of focal plane imaging systems and associated optics are discussed. Detailed discussion is focused on the two large millimeter-wavelength focal plane arrays presently in operation: the 8-element 1.3-mm-wavelength NRAO array on the 12-m telescope and the 15-element 3-mm-wavelength array on the FCRAO (five College ...
openaire   +1 more source