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  • Weitere Quellen  (5)
  • ASTRONOMY  (3)
  • Astronomy  (1)
  • PHYSICAL SCIENCES  (1)
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  • 1
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    Interstellar scintillation of extragalactic radio sources (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: Observations of 12 compact extragalactic sources were made at 2695 and 8085 MHz in order to detect weak intensity fluctuations caused by interstellar scintillation. Pulsar data are used to estimate the parameters of the interstellar medium needed to interpret the measured upper limits in terms of source angular diameters which are much larger than the scintillation cutoff diameter. It is shown that the observed source rms brightness temperatures are less than 10 to the 15th K and 10 to the 14th K at 2695 and 8085 MHz, respectively, making self-absorbed proton-synchroton radiation and high-brightness coherent mechanisms unlikely. If the sources are composed of 'point' components, each source can contain no fewer than 10,000 such components.
    Schlagwort(e): ASTRONOMY
    Materialart: Astrophysical Journal; 197; Apr. 1
    Format: text
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  • 2
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    Interstellar scattering of pulsar radiation. I - Scintillation (1975)
    In:  Other Sources
    Details
    Publikationsdatum: 2011-08-16
    Beschreibung: An investigation of the intensity fluctuations of 28 pulsars near 0.4 GHz indicates that spectra of interstellar scintillation are consistent with a Gaussian shape, that scintillation indices are near unity, and that the scintillation bandwidth depends linearly on dispersion measure. Observations at cm wavelengths show that the observer is in the near field of the scattering medium for objects with the lowest dispersion measures, and confirm the steep dependence of correlation bandwidth on dispersion measure found by Sutton (1971). The variations of scattering parameters with dispersion measure may indicate that the rms deviation of thermal electron density on the scale of 10 to the 11th cm grows with path length through the galaxy.
    Schlagwort(e): ASTRONOMY
    Materialart: Astronomy and Astrophysics; 43; 3, Oc; Oct. 197
    Format: text
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  • 3
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    New Pulsars from Arecibo Drift Scan Searches (2003)
    In:  CASI
    Details
    Publikationsdatum: 2018-06-06
    Beschreibung: We report new pulsars discovered in drift-scan data taken by two collaborations (Berkeley/Cornell and STScI/NAIC) during the latter stages of the Arecibo upgrade period. The data were taken with the Penn State Pulsar Machine and are being processed on the COBRA cluster at Jodrell Bank. Processing is roughly 70% complete and has resulted in the detection of 10 new and 31 known pulsars, in addition to a number of pulsar candidates. The 10 new pulsars include one pulsar with a spin-period of 55 ms and another with a spin period of 5.8 ms. At the completion of the processing, we expect to have discovered roughly 20 new pulsars. All new pulsars are being subjected to a program of followup observations at Arecibo to determine spin and astrometric parameters.
    Schlagwort(e): Astronomy
    Format: text
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  • 4
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    Pulsar average waveforms and hollow cone beam models (1975)
    In:  CASI
    Details
    Publikationsdatum: 2019-06-27
    Beschreibung: An analysis of pulsar average waveforms at radio frequencies from 40 MHz to 15 GHz is presented. The analysis is based on the hypothesis that the observer sees one cut of a hollow-cone beam pattern and that stationary properties of the emission vary over the cone. The distributions of apparent cone widths for different observed forms of the average pulse profiles (single, double/unresolved, double/resolved, triple and multiple) are in modest agreement with a model of a circular hollow-cone beam with random observer-spin axis orientation, a random cone axis-spin axis alignment, and a small range of physical hollow-cone parameters for all objects.
    Schlagwort(e): ASTRONOMY
    Materialart: NASA-TM-X-70917 , X-693-75-138
    Format: application/pdf
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  • 5
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    Proposed Integrated Radio-Telescope Network (1982)
    In:  Other Sources
    Details
    Publikationsdatum: 2019-06-28
    Beschreibung: Proposed network of radio telescopes, controlled by a central computer and managed by a single organization, offer potential for research on a scale that could not be matched by present privately and publicly-owned radio telescopes. With 10 antenna sites, network would establish base lines thousands of miles long. Antennas will be linked to computer center by telephone circuits.
    Schlagwort(e): PHYSICAL SCIENCES
    Materialart: NPO-15417 , NASA Tech Briefs (ISSN 0145-319X); 6; 2; P. 151
    Format: text
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