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  • Other Sources  (15)
  • SPACE RADIATION  (8)
  • ATOMIC AND MOLECULAR PHYSICS  (7)
  • Aerospace Medicine
  • Astronomy
  • Geophysics
  • 1990-1994  (15)
  • 1
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    A possible galactic association of bursts showing cyclotron lines (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Fifteen KONUS bursts and one HEAO burst showing cyclotron lines have well measured positions. If these are due to strongly magnetized neutron stars then we expect them to be associated with the galactic disk with a scale height of about 500 pc as expected for old neutron stars. The simplest way to test this hypothesis would be to test for a concentration along galactic latitude /b/ = 0. We got a marginal indication of such a concentration, and the probability that the 16 events are isotropically distributed is 0.02. We also show that this result is not in conflict with the present BATSE data set.
    Keywords: SPACE RADIATION
    Type: In: Gamma-ray bursts; Proceedings of the Workshop, Univ. of Alabama, Huntsville, Oct. 16-18, 1991 (A93-40051 16-93); p. 226-228.
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  • 2
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    TeV gamma rays from 3C 279 - A possible probe of origin and intergalactic infrared radiation fields (1992)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: The gamma-ray spectrum of 3C 279 during 1991 June exhibited a near-perfect power law between 50 MeV and over 5 GeV with a differential spectral index of -(2.02 +/- 0.07). If extrapolated, the gamma-ray spectrum of 3C 279 should be easily detectable with first-generation air Cerenkov detectors operating above about 0.3 TeV provided there is no intergalactic absorption. However, by using model-dependent lower and upper limits for the extragalactic infrared background radiation field, a sharp cutoff of the 3C 279 spectrum is predicted at between about 0.1 and about 1 TeV. The sensitivity of present air Cerenkov detectors is good enough to measure such a cutoff, which would provide the first opportunity to obtain a measurement of the extragalactic background infrared radiation field.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 390; 2, Ma
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  • 3
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    Cross-sections for the formation of negative ions by electron impact on silane (1991)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: Cross-sections and appearance potentials for the production of various negative ion species by electron impact on SiH4 have been measured. They are compared with two previous measurements which widely differ with each other. Hess' law has been applied to predict the various possible channels of dissociation.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: International Journal of Mass Spectrometry and Ion Processes (ISSN 0168-1176); 107; 83-89
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  • 4
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    The pressure broadening of NO2 in the millimeter and submillimeter wave spectral region (1990)
    In:  Other Sources
    Details
    Publication Date: 2011-08-19
    Description: Pressure-broadening parameters for 19 transitions of the millimeter and submillimeter wave spectrum of NO2 have been obtained experimentally. Results for broadening by N2, O2, and He are presented and compared with earlier theoretical calculations of the N2 and O2 parameters. A discussion of the relation between theoretical calculations and experimental measurements is presented.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Journal of Quantitative Spectroscopy and Radiative Transfer (ISSN 0022-4073); 43; 365-369
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  • 5
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    A measurement of the cosmic microwave background temperature at 7.5 GHz (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: The temperature of the cosmic microwave background (CMB) radiation at a frequency of 7.5 GHz (4 cm wavelength) is measured, obtaining a brightness temperature of T(CMB) = 2.70 +/- 0.08 K (68 percent confidence level). The measurement was made from a site near the geographical South Pole during the austral spring of 1989 and was part of an international collaboration to measure the CMB spectrum at low frequencies with a variety of radiometers from several different sites. This recent result is in agreement with the 1988 measurement at the same frequency, which was made from a different site with significantly different systematic errors. The combined result of the 1988 and 1989 measurements is 2.64 +/- 0.06 K.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 396; 1 Se; 3-9
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  • 6
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    The temperature of the cosmic microwave background radiation at 3.8 GHz - Results of a measurement from the South Pole site (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: As part of an international collaboration to measure the low-frequency spectrum of the cosmic microwave background (CMB) radiation, its temperature was measured at a frequency of 3.8 GHz, during the austral spring of 1989, obtaining a brightness temperature, T(CMB), of 2.64 +/-0.07 K (68 percent confidence level). The new result is in agreement with previous measurements at the same frequency obtained in 1986-88 from a very different site and has comparable error bars. Combining measurements from all years, T(CMB) = 2.64 +/-0.06 K is obtained.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 1 (ISSN 0004-637X); 381; 341-347
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  • 7
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    The submillimeter-wave spectrum of propionitrile (C2H5CN) (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: The laboratory millimeter-wave and submillimeter-wave rotational spectrum of propionitrile (ethyl cyanide, C2H5CN) in its ground vibrational state has been extended through J = 70 and K(sub a) = 36. Transitions measured in this study are in the frequency range 250-610 GHz. A fit of 952 transitions including 732 new measurements to a Watson A-reduced Hamiltonian has yielded a complete set of quartic and sextic distortion constants, in addition to six octic distortion constants. Internal rotation and hyperfine splittings have not been resolved, so they are not included in the analysis. Predicted transition frequencies for a large number of additional transitions of interest to radioastronomers are provided.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: The Astrophysical Journal: Supplement Series (ISSN 0067-0049); 93; 2; p. 589-610
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  • 8
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    Structure in the COBE differential microwave radiometer first-year maps (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: Results of the first year of data from the differential microwave radiometers on the Cosmic Background Explorer are presented. Statistically significant structure that is well described as scale-invariant fluctuations with a Gaussian distribution is shown. The rms sky variation, smoothed to a total 10-deg FWHM Gaussian, is 30 +/-5 micro-K for Galactic latitude greater than 20-deg data with the dipole anisotropy removed. The rms cosmic quadrupole amplitude is 13 +/-4 micro-K. The angular autocorrelation of the signal in each radiometer channel and cross-correlation between channels are consistent and give a primordial fluctuation power-law spectrum with index of 1.1 +/-0.5, and an rms-quadrupole-normalized amplitude of 16 +/-4 micro-K. These features are in accord with the Harrison-Zel'dovich spectrum predicted by models of inflationary cosmology.
    Keywords: SPACE RADIATION
    Type: Astrophysical Journal, Part 2 - Letters (ISSN 0004-637X); 396; 1, Se; L1-L5
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  • 9
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    An extension of the high-resolution millimeter- and submillimeter-wave spectrum of methanol to high angular momentum quantum numbers (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The high-resolution laboratory millimeter- and submillimeter-wave spectra of C-12H(3)OH and C-13H(3)OH have been extended to include transitions involving significantly higher angular momentum quantum numbers than studied previously. For C-12H(3)OH, the data set now includes 549 A torsional substate transitions and 524 E torsional substate transitions through J is not greater than 24, exclusive of blends. For C-13H(3)OH the data set now includes 453 A torsional substate transitions and 440 E torsional substate transitions through J is not greater than 24, exclusive of blends. The extended internal axis method Hamiltonian has been used to analyze the transitions to experimental accuracy. The molecular constants determined by this approach have been used to predict accurately the frequencies of many transitions through J = 25 not measured in the laboratory.
    Keywords: ATOMIC AND MOLECULAR PHYSICS
    Type: Astrophysical Journal Supplement Series (ISSN 0067-0049); 82; 1, Se; 405-444
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  • 10
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    Preliminary DMR measurements of the CMB isotropy (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: The COBE Differential Microwave Radiometers (DMR) instrument has produced preliminary full-sky maps at frequencies 31.5, 53, and 90 GHz. The redundant channels and matched beams at three frequencies distinguish the DMR from previous large-scale surveys. Galactic emission is seen unambiguously at all three frequencies. The only large-scale anisotropy detected in the cosmic microwave background is the dipole anisotropy. There is no clear evidence for any other large-angular-scale feature in the maps. Without correcting for any systematic effects, we are able to place limits DeltaT/T sub 0 less than 3 x 10 exp -5 for the rms quadrupole amplitude, DeltaT/T sub 0 less than 4 x 10 exp -5 for monochromatic fluctuations, and DeltaT/T sub 0 less than 4 x 10 exp -5 for Gaussian fluctuations (all limits are 95 percent C.L. with TO = 2.735 K). The data limit DeltaT/T sub 0 less than 10 exp -4 for any feature larger than 7 deg. We briefly review the DMR and discuss some implications of these results in cosmology.
    Keywords: SPACE RADIATION
    Type: In: After the first three minutes; Proceedings of the 1st Astrophysics Workshop, Univ. of Maryland, College Park, Oct. 15-17, 1990 (A93-23605 07-90); p. 95-106.
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