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  • 1
    Electronic Resource
    Electronic Resource
    Clustering of faint blue objects (1975)
    [s.l.] : Nature Publishing Group
    Nature 257 (1975), 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] To examine this question a IllaJ photograph of a region near the south Galactic pole has been compared with a red-sensitive photograph of the same region. Both plates reach very faint magnitudes and when viewed in a Zeiss comparator most images are similar on both plates-that is to say, are of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/257772a0
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  • 2
    Electronic Resource
    Electronic Resource
    Gravitational microlensing, quasar variability and missing matter (1993)
    [s.l.] : Nature Publishing Group
    Nature 366 (1993), S. 242-245 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Over the past 15 years or so a large-scale monitoring programme of quasars has been carried out using measures from the COSMOS high-speed microdensitometer at the Royal Observatory, Edinburgh, of a long sequence of wide-field photographs from the UK 1.2m Schmidt telescope in Australia. The ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/366242a0
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  • 3
    Electronic Resource
    Electronic Resource
    Decrease in the space density of quasars at high redshift (1996)
    [s.l.] : Nature Publishing Group
    Nature 384 (1996), S. 439-441 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Our search for radio-loud high-redshift quasars was based on a large sample of flat-spectrum Parkes radio sources from a survey region covering 40% of the sky (flat spectrum here means spectral index a 〉 —0.4 between wavelengths A of 11 and 6 cm, where flux density 5A oc Aa). ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/384439a0
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  • 4
    Electronic Resource
    Electronic Resource
    Automated detection of variable objects on Schmidt plates (1981)
    [s.l.] : Nature Publishing Group
    Nature 293 (1981), S. 116-120 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] I have previously reported* the discovery of a distant supernova on a sequence of Schmidt plates (the observing programme and other observational details are also described in ref. 4). Seven of the plates, together with the early epoch J3376, have now been measured in the image analysis mode of ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/293116a0
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  • 5
    Electronic Resource
    Electronic Resource
    The cosmological evolution of QSOs (reply) (1979)
    [s.l.] : Nature Publishing Group
    Nature 281 (1979), S. 406-406 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] STEWART AND HAWKINS REPLY-it seems clear that there is no essential disagreement between Wills' response and the primary result of our original paper1; that if one takes the evolutionary law and luminosity function for quasars widely found in the literature and models the (L, z) plot one finds a ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/281406a0
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  • 6
    Electronic Resource
    Electronic Resource
    Discovery of a very distant supernova (1980)
    [s.l.] : Nature Publishing Group
    Nature 286 (1980), S. 467-469 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] On a given night a deep UK 1.2-m Schmidt plate would be expected to show between one and ten supernovae depending on the supernova rate and the usable limiting magnitude. In the present observing programme one sky-limited plate was taken per night, clear of Moon, for 3 weeks between two lunations. ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/286467a0
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  • 7
    Electronic Resource
    Electronic Resource
    A method for determining the cosmological deceleration parameter q 0 (1977)
    [s.l.] : Nature Publishing Group
    Nature 265 (1977), S. 711-713 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The coordinates of the plate centre were: right ascension 2 h 41 min 00 s, declination ? 30"00' which is a field near the South Galactic Pole. The plate was exposed for 60 min on December 8, 1974, using a combination of unsensitised Eastman Kodak 098 emulsion and a Schott RG630 filter and was ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/265711a0
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  • 8
    Electronic Resource
    Electronic Resource
    Space density evolution of quasars (1978)
    [s.l.] : Nature Publishing Group
    Nature 276 (1978), S. 163-165 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Figure 1 shows the (Mv log z) plot of quasars from the catalogue of Burbidge et al.5, which were chosen to have z £ 2 and good photometry. The following assumptions have been made. First, quasar redshifts are of cosmological origin so that redshift is a valid indicator of distance, thus6 m=M ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/276163a0
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  • 9
    Electronic Resource
    Electronic Resource
    Three unusual cataclysmic variable stars (1983)
    [s.l.] : Nature Publishing Group
    Nature 301 (1983), S. 688-690 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] The procedure for detecting the variables, described in detail elsewhere1'2, involved measuring a sequence of Schmidt plates with the COSMOS measuring machine. The resulting data set consisted of B magnitudes for about 105 images from a set of eight plates. In the first instance a rather simple ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/301688a0
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  • 10
    Electronic Resource
    Electronic Resource
    Direct evidence for a massive galactic halo (1983)
    [s.l.] : Nature Publishing Group
    Nature 303 (1983), S. 406-408 
    Details
    ISSN: 1476-4687
    Source: Nature Archives 1869 - 2009
    Topics: Biology , Chemistry and Pharmacology , Medicine , Natural Sciences in General , Physics
    Notes: [Auszug] Preliminary results1 from a programme to detect faint variables using COSMOS measures of UK 1.2-m Schmidt plates included several RR Lyrae candidates. An extension of this work using additional plate material and the same analysis procedures revealed several new RR Lyrae candidates, and a programme ...
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1038/303406a0
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