Far-infrared observations of the galactic center
IR luminosity of galactic nucleus from far IR observations, noting considerations favoring nonthermal model consisting of multiple sources
Aumann, H. H.↗
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Detection of celestial sources at far-infrared wavelengths
Celestial sources far IR radiation detection using balloon-borne telescope
Friedlander, M. W.↗
X-rays from Centaurus A and the far-infrared background radiation
X ray and far IR measurement inconsistency from Centaurus A, discussing metagalactic submillimeter background
Ramaty, R.↗
Far-infrared emission from H II regions
Far IR fluxes from H II regions with solar luminosities at .02-2 times 10 to 7th
Harper, D. A.↗
Low frequency vibrations of molecular crystals. XIV - Raman and far-infrared spectra of HNCS and DNCS
Gaseous and solid polycrystalline HNCS and DNCS IR and Raman spectra, studying LF of lattice vibrations
Bragin, J.↗
Balloon measurements of the far-infrared background radiation.
Description of a balloon-borne radiometer designed to make direct measurements of the background radiation in the spectral range from 1 to 20 cm, and evaluation of the results of two balloon flights performed with the aid of this radiometer. Measurements in five different passbands in the spectral region below 20 per cm were made with a liquid-helium-cooled radiometer in two flights at approximately 40-km altitude. The results obtained are found to be consistent with a 2.7 K thermal radiation background. In addition, an atmospheric radiation of certain magnitude is found to dominate the region above 11 per cm.
Muehlner, D.↗
Far-infrared observations of celestial objects by balloon-borne telescope.
The instrument described is an f/5 Newtonian telescope with a parabolic pyrex primary mirror. The telescope tube is 1.5 m long. A 61 cm baffle is included to provide shielding from off-axis objects such as the earth, the moon, and the sun. An outline of the regions covered by sky surveys in June 1970 and in April 1971 is presented. Approximately 750 square degrees of the sky have been covered, including 100 degrees along the galactic plane.
Hoffmann, W. F.↗
Vibrational spectra of substituted hydrazines. IV - Raman and far-infrared spectra and structure of tetramethylhydrazine.
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Durig, J. R.↗
Far-infrared observations of galactic nuclei.
M82 (NGC 3034) and NGC 253 have been detected at wavelengths from 27 to 125 microns by using a 30-cm airborne IR telescope and a multiband photometer. Spectral power distribution curves are plotted for the galactic nuclei. Tables of obtained data are also given.
Harper, D. A., Jr.↗
New techniques for far-infrared filters.
The techniques considered make it possible to construct high performance low-pass wide-band, and medium-band filters at wavelengths in the range from 25 to 300 micrometers. Short wavelength rejection without appreciable loss at long wavelengths is achieved by means of small particle scattering. Spectral definition in the far infrared is obtained by cooling one or more crystalline materials to liquid-He or liquid-nitrogen temperatures. The problem of reflection losses at the various surfaces is solved by a new antireflection coating technique.
Armstrong, K. R.↗
Nonreciprocal reflection-beam isolators for far-infrared use
Magnetoplasma reflection-beam isolators for submillimeter-wave use are discussed in theory and experiment. The basic device uses the Kerr transverse magnetooptic effect (plane of polarization of the EM wave in the plane of incidence, which is perpendicular to a dc magnetic field) in InSb near room temperature. When the semiconductor slab is covered with a thin dielectric layer acting as a matching transformer, improved performance is predicted and observed at 337 microns, and very efficient isolator performance is predicted for 118 microns. Physical arguments are presented to explain the nonreciprocal phenomenon and lead to better device design.
Kanda, M.↗
Spectroscopy of dimers.
The method of Stogryn and Hirschfelder, which divides two-particle phase space into bound, metastable, and free particle parts, is applied to the statistical averages which determine the first three spectroscopic moments of 'collision-induced' far-infrared and Raman spectra. Numerical results are presented for a number of models of noble gas systems. It is shown that for some systems, but not all, dimers make important, although not necessarily well-separated, contributions to the spectrum.
Levine, H. B.↗
The 100-micron observations of galactic and extragalactic Southern Hemisphere objects
Far-infrared observations of the interstellar medium are reported by a balloon-borne telescope. With the 30-centimeter (12-in.) telescope operating at a wavelength of 100 microns, approximately forty new sources were observed in the galactic plane and in the large Magellanic Cloud. Patterns and some degree of understanding are beginning to emerge from the observations of objects in the far infrared.
Hoffmann, W. F.↗
A simple analytic approximation for dusty stromgren spheres.
We interpret recent far-infrared observations of H II regions in terms of true absorption by internal dust of a significant fraction of the Lyman-continuum photons. We present approximate analytic expressions describing the effects of internal dust on the ionization structure of H II regions, and outline a procedure for deducing the properties of this dust from optical and infrared observations.
Petrosian, V.↗
Balloon observations of galactic and extragalactic objects at 100 microns.
Recent far-infrared balloon-borne instruments have yielded observations of a number of bright sources at 100 microns. Many of these coincide with HII regions where molecular line emision has been detected. There is some indication of 100 micron emission which does not coincide with radio measurements.
Hoffmann, W. F.↗
Review of results in infrared space astronomy.
Some stars, in particular, T Tauri stars, have substantial IR excesses at 10 microns. It is now understood that the long wavelength radiation comes from a shell of dust which surrounds the star and absorbs the stellar radiation. Part of the mass which is lost from supergiants is condensed into solid particles which remain in the stellar environment and provide the excess IR radiation. The most intense far-infrared object outside the solar system is the galactic center. Diffuse galactic IR objects include extended regions of gas and dust surrounding very hot young stars and regions of gas and dust surrounding cooler stars. Other subjects considered include IR galaxies and cosmic radiation.
Hoffmann, W. F.↗
Further measurements of the submillimeter background at balloon altitude.
Results of measurements of the far-infrared background radiation made with a balloon-borne radiometer at an altitude of 44 km. Equivalent blackbody temperatures were obtained for the background radiation in three bandwidths: 1 to 11.5 per cm, 1 to 13.5 per cm, and 1 to 18.5 per cm. The total measured flux in the largest of these bandwidths is dominated by the atmospheric emission by ozone and water. The data obtained confirm the results of prior flights, in particular, that a substantial amount, and perhaps all, of the radiation above 13 per cm is due to the atmosphere.
Muehlner, D. J.↗
The Lunar and Planetary Laboratory and its telescopes.
The campus and observatory facilities of the Lunar and Planetary Laboratory at the University of Arizona are described, with particular reference to the Space Sciences Building and its Optical Shop. The Catalina Observatory (located on a peak of the Catalina Mountains, 36 miles from the University) and its facilities intended for planetary photography, near-infrared spectroscopy and interferometry, far-infrared broadband photometry and image scanning, and studies of asteroids, comets, and other stellar studies are discussed. The layout, facilities, and telescopes of the Mount Lemmon Observatory intended for infrared astronomical research are also covered.
Kuiper, G. P.↗