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  • 1
    Electronic Resource
    Electronic Resource
    ASTRONOMICAL EDUCATION AND MANPOWER IN CANADA (1972)
    Oxford, UK : Blackwell Publishing Ltd
    Annals of the New York Academy of Sciences 198 (1972), 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.1749-6632.1972.tb12704.x
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  • 2
    Electronic Resource
    Electronic Resource
    Clusters of galaxies as gravitational lenses? (1976)
    [s.l.] : Nature Publishing Group
    Nature 260 (1976), S. 764-765 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Consider a source of radiation at a distance Lcz/H0 from the observer, in a universe which is homogeneous on some sufficiently large scale, with mean density ru. The line of sight to the source may, however, be such that the mean density along the beam of light, 〈r〉, differs from ru. The cross ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/260764a0
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  • 3
    Electronic Resource
    Electronic Resource
    IUE observations of extragalactic objects (1978)
    [s.l.] : Nature Publishing Group
    Nature 275 (1978), S. 404-414 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] DURING the commissioning high priority target phase of IUE several classes of extragalactic object were observed at low dispersion with both the short- and long-wavelength cameras. Although the instrument was not fully optimised, scientifically useful spectra were obtained for the Seyfert galaxies ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/275404a0
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  • 4
    Electronic Resource
    Electronic Resource
    The present appearance of white holes (1978)
    [s.l.] : Nature Publishing Group
    Nature 273 (1978), S. 449-450 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Previous discussions of the optical appearance of white holes have been concerned with the analysis of only radial null geodesies and have assumed that radiation from white holes is strongly blueshifted2'3. We find that radiation from the white holes mentioned above is strongly blueshifted for only ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/273449a0
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  • 5
    Electronic Resource
    Electronic Resource
    Significance of the angular diameter-redshift relation (1975)
    [s.l.] : Nature Publishing Group
    Nature 255 (1975), S. 124-125 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The observational relations in the standard, homogeneous Friedmann models (HFM) have been generalised by Dyer and Roeder2 to take into account the fact that the Universe may be quite inhomogeneous on the scale of galaxies and clusters of galaxies. The inhomogeneities are put into the models ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/255124a0
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  • 6
    Electronic Resource
    Electronic Resource
    Red-shifts and Power Outputs of Quasi-stellar Radio Sources (1966)
    [s.l.] : Nature Publishing Group
    Nature 212 (1966), S. 165-166 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Table i. LIST OF RADIO GALAXIES FROM THE SCR CATALOGUE WITH KNOWN RED-SHIFTS 3C17 28 33 40 66 71 75 78 79 3C88 98 171 192 198 219 223 223-1 234 3C264 270 277-3 287-1 293 295 296 305 310 3(7315 317 327 338 348 353 371 382 3(7390-3 433 436 442 445 452 456 459 465 Fig. 1 shows log z ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/212165a0
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  • 7
    Electronic Resource
    Electronic Resource
    Absorption Lines in the Spectra of Quasi-stellar Objects (1968)
    [s.l.] : Nature Publishing Group
    Nature 220 (1968), S. 772-773 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] We have calculated the probability that radiation from a remote object will pass through at least one intervening galaxy using various models of the universe4. For the sake of the present discussion we adopt the world model recently suggested by Solheim5 with a deceleration parameter g0= - 1-4 and ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/220772a0
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  • 8
    Electronic Resource
    Electronic Resource
    Blackbody Radiation and the Eddington–Lemaître Universe (1967)
    [s.l.] : Nature Publishing Group
    Nature 216 (1967), S. 774-775 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] This communication shows that such radiation could also be present in a universe which is of the Eddington-Lemaitre type4-that is, which expands from a finite static state in the infinite past. In contrast to the hot models mentioned, and the cold model described by Zeldovitch5, the modified ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/216774a0
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  • 9
    Electronic Resource
    Electronic Resource
    On old universes and galaxy evolution (1969)
    Springer
    Astrophysics and space science 3 (1969), S. 530-541 
    Details
    ISSN: 1572-946X
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract It is assumed that the universe can be represented by low density Friedmann models with non-zero cosmological constant and long ages. By comparing theoretical and observational apparent magnitude-redshift relations, the rates of galaxy evolution required to force coincidence of these relations in visual light are deduced for each model. These rates are compared with various recent estimates of this effect and are also used to predict the slope of the bright end of the luminosity function of elliptical galaxies. Both the comparison and the prediction indicate that, unless the slope of the bright end of the luminosity function is considerably flatter than that produced by extrapolation, it is impossible to assign all of the difference between theory and present observations to evolutionary effects. Such an assignment could, however, be made if a dispersion in the luminosities of the most distant galaxies is found.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00704858
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  • 10
    Electronic Resource
    Electronic Resource
    Galaxies as gravitational lenses: Realistic models (1981)
    Springer
    General relativity and gravitation 13 (1981), S. 591-597 
    Details
    ISSN: 1572-9532
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract The gravitational lens effects associated with a transparent mass distribution are quite different from those of the well-known opaque sphere. We have shown that any spherical galaxy whose mass distribution, when projected onto the plane of the sky, decreases outward from the center of the galaxy and diverges less rapidly than 1/h ash→0, must always produce an odd number of images, usually one or three, of a source located behind the galaxy. Using optical scalar techniques, the amplification of each image can readily be obtained. For a given source and galaxy, we can define a dimensionless focal length, a function of impact parameter, and a dimensionless distance factor, depending on lens parameters and source distance. The central value of the ratio of these quantities determines the multiplicity of the images. The mass distribution of the galaxy is a crucial function, and we show in some detail how this affects the various focal lengths.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00757245
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