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  • 1975-1979  (4)
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Materialart
Erscheinungszeitraum
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  • 1
    Digitale Medien
    Digitale Medien
    Soft X-ray search of centre of Cygnus Loop (1975)
    [s.l.] : Nature Publishing Group
    Nature 258 (1975), S. 214-215 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] Rocket measurements1 indicate that a central object exists, and contributed, at the time of observation, about 4 % of the X-ray flux from the entire loop. This object may be variable1'2 in intensity, and may even be pulsing1. Reanalysis of earlier rocket data3 gives statistically more significant ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/258214a0
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 2
    Digitale Medien
    Digitale Medien
    Measured offset between the Crab pulsar and Tau X-1 (1975)
    [s.l.] : Nature Publishing Group
    Nature 253 (1975), S. 610-612 
    Details
    ISSN: 1476-4687
    Quelle: Nature Archives 1869 - 2009
    Thema: Biologie , Chemie und Pharmazie , Medizin , Allgemeine Naturwissenschaft , Physik
    Notizen: [Auszug] On October 7, 1974, the orbit of the satellite took it through the Tau X-l lunar occultation 'shadow' on two successive orbits, enabling us to observe two disappearances (Di and Dz) and two reappearances (Ri and R〉) of the Crab Nebula with a collimated proportional counter operating in the energy ...
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1038/253610a0
    Bibliothek Standort Signatur Band/Heft/Jahr Verfügbarkeit
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  • 3
    Digitale Medien
    Digitale Medien
    ‘Copernicus’ observations of extragalactic X-ray sources (1976)
    Springer
    Astrophysics and space science 42 (1976), S. 249-254 
    Details
    ISSN: 1572-946X
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The MSSL X-ray detectors onCopernicus have been used to study a number of extragalactic objects. At least three classes of unresolved sources are found and we suggest that accretion may be the dominant mechanism. The mass of the accreting object then determines the X-ray emission properties.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00645549
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  • 4
    Digitale Medien
    Digitale Medien
    The X-ray spectra of clusters of galaxies (1979)
    Springer
    Naturwissenschaften 66 (1979), S. 433-437 
    Details
    ISSN: 1432-1904
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie , Chemie und Pharmazie , Allgemeine Naturwissenschaft
    Notizen: Abstract The identification of extended sources of X-ray emission associated with clusters of galaxies has been one of the major achievements of X-ray astronomy. In this paper the present situation regarding the identification of X-ray clusters is reviewed and the relationship between X-ray and optical cluster properties is briefly discussed. Measurements of X-ray extent have been made for a small number of clusters and the status of these observations is described. The nature of the X-ray emission process and the observations which have led to our present understanding of cluster X-ray production are examined in some detail. Observations at other wavelengths that are relevant to this problem are also discussed. The available evidence suggests that the X-ray emission is due to bremsstrahlung from high-temperature (T〉2·107 K) gas that is present in the space between cluster galaxies. Current models of the origin of this gas and of its likely heating mechanism are presented.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00398999
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