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  • 1
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    NGC 1275 /3C 84/ - Similar structure in the optical and 3-mm radio variations (1979)
    In:  Other Sources
    Details
    Publication Date: 2011-08-17
    Description: Optical and 3.3-mm data for the Seyfert galaxy NGC 1275 (3C 84) are compared. Similarities exist between the variations at the two wavelengths with regard to amplitude, time scale, and interval between events. The question is raised whether these similarities may be the result of a common triggering mechanism.
    Keywords: ASTROPHYSICS
    Type: Astronomical Society of the Pacific; vol. 91
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  • 2
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    High-resolution X-ray observations of the Cassiopeia A supernova remnant with the Einstein Observatory (1979)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Cas A was observed with the imaging detectors on the Einstein X-ray Observatory. The mass of the expanding shell due to the interaction of the blast wave and the ambient medium is determined. This indicates that Cas A is probably not in the free expansion phase, but has not yet reached the adiabatic phase of expansion. Detailed comparison of X-ray, optical, and radio images shows various degrees of correlation, indicating that several processes for emission are present. An upper limit of 1,500,000 K is established for any stellar remnant that is below the expected temperature of a neutron star by a factor of about 5. The total mass of the SNR is found to be 10-30 solar masses
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 234
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  • 3
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    The generation of gravitational radiation by escaping supernova neutrinos (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Formulae for the gravitational radiation due to the anisotropic axisymmetric emission of neutrinos from a small source are derived. We find that a burst of neutrinos released anisotropically from a supernova will generate a burst of gravitational radiation that may be comparable in amplitude and energy to the gravitational radiation generated by the fluid motion in the collapse of the supernova core.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 223
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  • 4
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    Effects of primordial fluctuations on the abundances of light elements (1975)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Some of the effects of primordial inhomogeneities on the production of H-2, He-3, and Li-7 are investigated. For the most part, temperature fluctuations have only small effects on the abundances. The density fluctuations are modeled by a unimodal distribution so that the Universe is characterized by the mean density and the relative amplitude of the density variations. It has been found that the constraint which H-2 production imposes on the mean mass density is eased somewhat by allowing for density inhomogeneities. However, unless the composition of the interstellar matter is atypical of most of the matter in the Universe, the mass density will be at least a factor of 3 below the critical density. For reasonable estimates of the pregalactic abundances, sufficient He-3 and Li-7 cannot be produced in the same model universe. Production of both Li-7 and H-2 requires large-amplitude primordial fluctuations, while sufficient He-3 and H-2 can be formed in very low-density, fairly homogeneous universes.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 197; Apr. 15
    Format: text
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  • 5
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    ANS observations of Cygnus X-1 (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Cygnus X-1 was observed from 3 November until 9 November 1974, using the hard X-ray (1-28 keV) and soft X-ray (1-8 keV) experiment on board the Astronomical Netherlands Satellite. On three occasions, on 4 and 5 November, the X-ray spectrum was observed to be harder, while the flux intensity in the 1-7 keV ranges decreased by about 50% from its quiescent value. These events occurred near and following the time of superior conjunction of the likely optical counterpart HDE 226 868. These events appear to be the same as previously reported absorption dips and reveal this phenomenon to be more complex than had been believed. A systematic study of the X-ray spectral variations in these energy bands, on a time scale of 64 seconds over the period of the spectroscopic binary, is presented.
    Keywords: ASTROPHYSICS
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  • 6
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    The binary pulsar - Post-Newtonian timing effects (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: Certain post-Newtonian effects may be observable in the arrival times of pulses from the binary pulsar PSR 1913+16. Such effects include the gravitational propagation delay and the post-Newtonian corrections to the elliptical binary orbit. Fitting a model of these effects as they are predicted by general relativity to the pulse arrival times permits the estimation of more parameters than are necessary to determine the orbit and masses of the system. This redundancy provides an important check of the assumption that the observed periastron precession rate is entirely due to the effect of general relativity on compact masses.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 216
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  • 7
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    Variability of LMC X-4 (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: X-rays in the 2-11-keV band were detected from LMC X-4 using the rotating modulation collimator system on SAS-3. The derived X-ray luminosity of LMC X-4 is of the order of 10 to the 38th power ergs/s. A transition to a high-intensity state which lasted about 40 minutes was detected during which short-time-scale flares (about 20 s) were observed. The temporal and spectral behavior of LMC X-4 is found to be similar to that of several X-ray binaries. A derived 90% error circle with a radius of 1 arcmin is also presented.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 216
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  • 8
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    Neutrino angular momentum loss in rotating stars (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: We consider how an axisymmetric, uniformly and slowly rotating homogeneous star might be affected by the loss of energy and angular momentum via neutrino emission. For example, these losses can cause a collapsing, rotating star to flatten either faster or slower than would be the case if these losses were not taken fully into account, depending on the efficiency of the angular momentum loss mechanism.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 219
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  • 9
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    Detection of X-rays from Algol /beta Persei/ (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: X-rays in the 2-6 keV band were detected from the Algol system using the rotating modulation collimator system on SAS-3 during an observation in October 1975. The measured X-ray flux is 3.8 x 10 to the -11th ergs/sq cm/s/keV. No positive detection was made in the 6-11 keV band. The data are consistent with either a power-law spectrum with photon spectral index not less than 2.5 or a thermal bremsstrahlung spectrum with a temperature not greater than 3 x 10 to the 7th K.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; 210; Dec. 1
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  • 10
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    The X-ray structure of NGC 5128 (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: During an observation of NGC 5128 (Cen A) by the rotating modulation collimator on board the SAS-3 X-ray observatory in early June 1975, data were obtained which suggest the presence of an extended source with about 3 arcmin FWHM surrounding an extremely compact object located at the radio/IR nucleus. The point component exhibited a 25% increase in intensity over a period of 2 to 5 hours.
    Keywords: ASTROPHYSICS
    Type: Astrophysical Journal; vol. 219
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