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  • 1
    Electronic Resource
    Electronic Resource
    QUASARS (1973)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 224 (1973), S. 0 
    Details
    ISSN: 1749-6632
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Natural Sciences in General
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1111/j.1749-6632.1973.tb41435.x
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Optical and X-ray aspects of quasars
    Amsterdam : Elsevier
    Advances in Space Research 3 (1984), S. 175-180 
    Details
    ISSN: 0273-1177
    Keywords: Quasars ; cosmological evolution ; optical and X-ray observations
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics , Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0273-1177(84)90083-8
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  • 3
    Electronic Resource
    Electronic Resource
    Infrared Background from Seyfert Galaxies (1970)
    [s.l.] : Nature Publishing Group
    Nature 227 (1970), S. 586-587 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] A class of objects with a present (2 = 0) space density po and luminosity L0 in relativistic models with zero pressure and zero cosmological constant fills the universe with radiation with an energy density given by6 Here q0 is the deceleration parameter and z is the maximum redshift after which ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/227586a0
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    Paper (German National Licenses)
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  • 4
    Electronic Resource
    Electronic Resource
    Model for the Evolution of Extended Radio Sources (1968)
    [s.l.] : Nature Publishing Group
    Nature 219 (1968), S. 127-131 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Large radio sources are influenced by the intergalactic medium and the cosmic black body radiation, both of which depend on red-shift in a predictable way. The type of source evolution implied by the radio data can be fitted by a simple model. This topic links with the X-ray background and the ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/219127a0
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Extragalactic Soft X-ray Astronomy (1968)
    [s.l.] : Nature Publishing Group
    Nature 217 (1968), S. 326-329 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The opacity of the galaxy to soft X-rays may be less than previously supposed. This may permit a variety of extragalactic objects to be observed at ∼50 Å. Some implications of this situation are discussed ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/217326a0
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  • 6
    Electronic Resource
    Electronic Resource
    X-ray sources and the diffuse background (1970)
    Springer
    Astrophysics and space science 9 (1970), S. 185-192 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract Possible numbers of X-ray sources at various flux levels are considered and their contribution to the background evaluated. Our conclusions are: The mean spectrum of Quasi-Stellar Objects and the nuclei of Seyfert galaxies between optical and X-ray wavelengths is characterized by a spectral index well in excess of 1.0. These objects may make an important contribution to the soft X-ray background. Observations of Q.S.O. may allow a decisive test for the cosmological interpretation of the redshifts of the Q.S.O. With regard to galactic sources we find that few undetected sources of the Sgr-Sco type exist, that these sources are located in the immediate neighborhood of the galactic center and that they account for at least 80% of the total galactic source luminosity. However, many intrinsically much fainter galactic sources may exist.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00649964
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