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  • ASTRONOMY  (12)
  • AEROSPACE MEDICINE  (10)
  • PHYSICS, PLASMA  (6)
  • 1
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    A partial list of southern clusters of galaxies (1990)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-19
    Beschreibung: An inspection of 34 SRC/ESO J southern sky fields is the basis of the present list of clusters of galaxies and their approximate classifications in terms of cluster concentration, defined independently of richness and shape-symmetry. Where possible, an estimate of the cluster morphological population is provided. The Bautz-Morgan classification was applied using a strict comparison with clusters on the Palomar Sky Survey. Magnitudes were estimated on the basis of galaxies with photoelectric or photographic magnitudes.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysics and Space Science (ISSN 0004-640X); 173; 2, No; 265-292
    Format: text
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  • 2
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    Ion acoustic waves in a multi-ion plasma. (1971)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: An exact treatment of the multispecies ion acoustic dispersion relation is given for an argon/helium plasma. Phase velocity and damping are obtained as a function of ion-electron temperature ratio and relative densities of the two species. There are two important modes in the plasma, with quite different phase velocities, which are referred to as principal heavy ion mode and principal light ion mode. Which of these is dominant depends on the relative densities of the two components, but, in general, the light ion mode becomes important for surprisingly small light ion contamination. Approximate analytic expressions are derived from damping rates and phase velocities and their domains of validity are investigated. Relevance of the results for the investigation of collisionless shocks is discussed.
    Schlagwort(e): PHYSICS, PLASMA
    Materialart: Physics of Fluids; 14; Nov. 197
    Format: text
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  • 3
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    Medium energy gamma ray astronomy with transpacific balloon flights (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Transpacific balloon flights with the University of California, Riverside (UCR) double scatter telescope are discussed. With flight durations from 5 days up to perhaps 15 days the long observation times necessary for medium energy (1-30 MeV) gamma ray astronomy can be obtained. These flights would be made under the auspices of the Joint U.S.-Japan Balloon Flight Program at NASA. It is proposed that flights can provide at least 30 hours of observation time per flight for many discrete source candidates and 120 hours for detecting low intensity cosmic gamma ray bursts.
    Schlagwort(e): ASTRONOMY
    Format: text
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  • 4
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    A 1400-MHz survey of 1478 Abell clusters of galaxies (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: Observations of 1478 Abell clusters of galaxies with the NRAO 91-m telescope at 1400 MHz are reported. The measured beam shape was deconvolved from the measured source Gaussian fits in order to estimate the source size and position angle. All detected sources within 0.5 corrected Abell cluster radii are listed, including the cluster number, richness class, distance class, magnitude of the tenth brightest galaxy, redshift estimate, corrected cluster radius in arcmin, right ascension and error, declination and error, total flux density and error, and angular structure for each source.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomical Journal; 87; Aug. 198
    Format: text
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  • 5
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    Cryogenic telescope on the Infrared Astronomical Satellite (IRAS) (1984)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-18
    Beschreibung: The Infrared Astronomical Satellite (IRAS) has completed an unbiased all-sky survey at wavelengths from 10 to 100 microns. The design and performance of the focal plane array is described with emphasis on in-orbit measurements of the sensitivity and stability. In the four broad spectral bands centered at 12, 25, 60, and 100 microns, the system noise equivalent flux density (NEFD) values are in Jy/(Square root of Hz), 0.03, 0.025, 0.046, and 0.21, respectively (Jansky = 10 to the -26th W/sq m/Hz). For point sources, a single scan at the survey rate of 3.8 arcmin/s yields limiting flux densities at the 3-sigma confidence level of 0.36, 0.30, 0.39, and 1.2 Jy. The dc stability of the junction field effect transistor (JFET) amplifiers and the excellent off-axis rejection of the telescope permit total flux measurements of extended infrared emission at levels below 6,000,000 Jy/sr. Response of the extrinsic silicon and germanium photo-detectors to ionizing radiation is described.
    Schlagwort(e): ASTRONOMY
    Materialart: Optical Engineering (ISSN 0091-3286); 23; 122-127
    Format: text
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  • 6
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    The Hubble Space Telescope high speed photometer (1988)
    In:  CASI
    Details
    Publikationsdatum: 2013-08-31
    Beschreibung: The Hubble Space Telescope will provide the opportunity to perform precise astronomical photometry above the disturbing effects of the atmosphere. The High Speed Photometer is designed to provide the observatory with a stable, precise photometer with wide dynamic range, broad wavelenth coverage, time resolution in the microsecond region, and polarimetric capability. Here, the scientific requirements for the instrument are examined, the unique design features of the photometer are explored, and the improvements to be expected over the performance of ground-based instruments are projected.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA, Ames Research Center, Second Workshop on Improvements to Photometry; p 1-15
    Format: application/pdf
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  • 7
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    Evaluation of a 256 x 256 Si:As IBC detector array for astronomy (1994)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-04-02
    Beschreibung: 256 x 256-element IBC Si:As arrays have been evaluated for applications in IR astronomy from space-borne platforms. Basic figures of merit were measured at IR flux levels simulating those expected in space-based astronomical observations. Results include dark current less than 20 e(-)/s, G-eta as high as 3.8, eta/beta of 20%, and read noise below 100 rms(e(-)).
    Schlagwort(e): ASTRONOMY
    Materialart: Experimental Astronomy (ISSN 0922-6435); 3; 1-4; p. 167-168
    Format: text
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  • 8
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    SC 2059-247 - An unusual radio/X-ray source in a distant cluster of galaxies (1981)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: The X-ray, optical and radio properties of a high redshift, Bautz-Morgan type I cluster of galaxies, namely SC 2059-247, are examined. This cluster is optically dominated by a cD galaxy with a powerful flat-spectrum radio source coincident with the possibly stellar nucleus. Two possible interpretations are suggested for the apparently soft X-ray spectrum of the extremely luminous cluster. Either the intracluster gas is much cooler in high-redshift clusters because they are less relaxed, or the X-ray and radio emissions from SC 2059-247 are the result of a nonthermal QSO/BL Lac type object in the nucleus of the cD. If the latter, it would be the first time that an X-ray source similar to a quasar or BL Lac object has been discovered in a previously identified galaxy.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; vol. 245
    Format: text
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  • 9
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    An integrative approach to space-flight physiology using systems analysis and mathematical simulation (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: An approach was developed to aid in the integration of many of the biomedical findings of space flight, using systems analysis. The mathematical tools used in accomplishing this task include an automated data base, a biostatistical and data analysis system, and a wide variety of mathematical simulation models of physiological systems. A keystone of this effort was the evaluation of physiological hypotheses using the simulation models and the prediction of the consequences of these hypotheses on many physiological quantities, some of which were not amenable to direct measurement. This approach led to improvements in the model, refinements of the hypotheses, a tentative integrated hypothesis for adaptation to weightlessness, and specific recommendations for new flight experiments.
    Schlagwort(e): AEROSPACE MEDICINE
    Materialart: The 11th Space Simulation Conf.; p 149-162
    Format: application/pdf
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  • 10
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    WQ 2059-247: An unusual high redshift X-ray cluster (1980)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: X-ray, optical, and radio observations of a high redshift, Bautz-Morgan type I cluster of galaxies are reported. The cD galaxy contains a powerful, flat spectrum radio source coincident with the possibly stellar nucleus. The cluster is an extremely luminous X-ray source; however, unlike nearby luminous X-ray clusters the X-ray spectrum appears to be rather soft. Two possible interpretations of the soruces are suggested: either the intracluster gas is much cooler in high redshift clusters because they are less relaxed, or the X-ray and radio emissions from WQ 2059-247 are the result of a non thermal QSO/BL Lac type object in the nucleus of the cD.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-CR-163619
    Format: application/pdf
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