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  1. No Access

    Chapter and Conference Paper

    Testing Models of Radio Source Space Density Evolution with the SUMSS Survey

    We present the population data as predicted by our space density analysis at the SUMSS frequency of 843 MHz. This data demonstrates the potential of the SUMSS survey to trace in detail the change-over in radio...

    C. A. Jackson, J. V. Wall in Looking Deep in the Southern Sky (1999)

  2. No Access

    Chapter and Conference Paper

    Variance and Skewness in the FIRST Survey

    We investigate the large-scale clustering of radio sources by analysing the distribution function of the FIRST 1.4 GHz survey. We select a reliable galaxy sample from the FIRST catalogue, paying particular att...

    M. Magliocchetti, S. J. Maddox, O. Lahav, J. V. Wall in Looking Deep in the Southern Sky (1999)

  3. No Access

    Chapter and Conference Paper

    Cosmological Inference from New Radio Surveys

    In 1976 and 1977 a series of elegant papers by Adrian Webster (1976 et seq.) apparently laid to rest the prospect of topological cosmology from radio surveys. Introducing astronomers to Fourier Power Spectrum Ana...

    J. V. Wall in Observational Cosmology (1998)

  4. No Access

    Chapter and Conference Paper

    Declining Quasar Fractions as Evidence for Unified Schemes

    This paper presents results from our new statistical analysis which is based on unified schemes for the high-power FRII and moderate-power FRI radio sources, and which explores the evolution and Doppler beamin...

    C. A. Jackson, J. V. Wall in Observational Cosmology (1998)

  5. No Access

    Chapter and Conference Paper

    Clusters of Galaxies at Intermediate Redshifts from the NRAO VLA Sky Survey

    One of the major topics in modern cosmology and astrophysics concerns the present status and the past evolution of clusters of galaxies, as well as the knowledge of their abundance, spatial correlations, morph...

    A. Zanichelli, R. Scaramella, M. Vigotti, G. Vettolani… in Observational Cosmology (1998)

  6. No Access

    Chapter and Conference Paper

    Multi-Object Spectroscopy and Radio Surveys

    Studies of radio-source astrophysics and cosmology are based on samples for which typically 10 to 100 redshifts have been measured. Such samples are grossly inadequate given the diversity of radio-source popul...

    J. V. Wall, C. A. Jackson in Wide-Field Spectroscopy (1997)

  7. No Access

    Article

    Decrease in the space density of quasars at high redshift

    QUASARS have been found up to redshifts of almost five, corresponding to an epoch when the Universe was less than ten per cent of its present age. This leaves a rather short time for the formation of the galax...

    P. A. Shaver, J. V. Wall, K. I. Kellermann, C. A. Jackson, M. R. S. Hawkins in Nature (1996)

  8. No Access

    Chapter

    Map** Large-Scale Structure with Radio Sources

    In regions away from the Galactic plane, formal tests indicate an isotropic, random and independent distribution of radio sources on the sky (e.g. [1], although there are strong indications of large-scale anomali...

    J. V. Wall, C. R. Benn, A. J. Loan in Examining the Big Bang and Diffuse Backgro… (1996)

  9. No Access

    Chapter and Conference Paper

    Space Densities for Powerful Radio Sources in the Light of Unification

    As radio survey frequency is raised the proportion of flat-spectrum sources increases in bright fiux-limited samples (eg Wall 1994, Aust J Phys 47, 625). Differential source counts show a corresponding broadening...

    C. A. Jackson, J. V. Wall in Extragalactic Radio Sources (1996)

  10. No Access

    Chapter and Conference Paper

    The Space Density of High-Redshift Quasars

    An upper limit on the space density of quasars at z > 5 is obtained independent of any optical magnitude limit, from the complete identification of a large sample of flat-spectrum radio sources. This upper lim...

    P. A. Shaver, J. V. Wall, K. I. Kellermann, C. Jackson… in Extragalactic Radio Sources (1996)

  11. No Access

    Chapter and Conference Paper

    Space Distribution of Radio-Source Populations

    This paper sets out the status of data determining the space distribution of extragalactic radio-source populations, describes some recent results from analyses of the data, and indicates why and how the analy...

    J. V. Wall in Extragalactic Radio Sources (1996)

  12. No Access

    Chapter and Conference Paper

    Interacting and Active IRAS Galaxies

    We decided to study a complete sample of, predominantly high IR luminosity, IRAS galaxies to determine the fractions that were interacting or active.

    K. J. Leech, A. Lawrence, M. Rowan-Robinson… in Dynamics and Interactions of Galaxies (1990)

  13. No Access

    Chapter

    The Early Universe — An Observer’s View

    Three aspects of an observer’s early universe are discussed: primordial helium abundance as determined from observations of blue compact galaxies; the small-scale structure of the microwave background radiatio...

    J V Wall in The Early Universe (1988)

  14. No Access

    Chapter and Conference Paper

    Stellar Dynamics of Radio Elliptical Galaxies

    Stellar kinematical and dynamical results are presented for 34 radio ellipticals. The radio galaxies we observed were brighter than m(B)=l6. The results show that these radio ellipticals are not generally more...

    A. Sansom, J. V. Wall, W. B. Sparks in Structure and Dynamics of Elliptical Galaxies (1987)

  15. No Access

    Chapter and Conference Paper

    Radio Source Counts and their Interpretation

    Radio source counts at several wavelengths are shown and discussed in terms of evolving populations. The deepest counts now reach a surface density close to a million sources per steradian. At this level essen...

    K. I. Kellermann, J. V. Wall in Observational Cosmology (1987)

  16. No Access

    Article

    Pavo XD-10, an X-ray QSO with extended optical structure

    Deep charge-coupled device (CCD) images of the quasi-stellar object (QSO) identified with the Einstein X-ray source Pavo XD-10 show an optical structure that is dramatically extended. Here we discuss the morph...

    R. Gilmozzi, J. V. Wall, P. G. Murdin, P. R. Jorden, D. J. Thorne… in Nature (1985)

  17. No Access

    Chapter

    A 6-CM Deep Sky Survey

    In order to extend radio source counts to lower flux density, we have used the VLA to survey a small region of sky at 4.885 GHz (6 cm) to a limiting flux density of 50 µJy. Details of this deep survey are give...

    E. B. Fomalont, K. I. Kellermann, J. V. Wall in Early Evolution of the Universe and its Pr… (1983)

  18. No Access

    Chapter

    New Limits to the Small Scale Fluctuations in the Cosmic Background Radiation

    The VLA has been used at 4.9 GHz to observe a small region of sky in order to extend the radio source count to low flux density (Fomalont et al., these proceedings) and to look for small scale fluctuations in ...

    K. I. Kellermann, E. B. Fomalont, J. V. Wall in Early Evolution of the Universe and its Pr… (1983)

  19. No Access

    Chapter and Conference Paper

    Cosmological Evolution of QSOs and Radio Galaxies

    These lectures represent a personal account of present understanding of the spatial distribution of QSOs and radio galaxies — the luminosity functions and their dependence on cosmic epoch. I suggest five inter...

    J. V. Wall in The Origin and Evolution of Galaxies (1983)

  20. No Access

    Article

    A CCD image of the galactic centre

    Because the galactic centre lies behind approximately 27 magnitudes of visual extinction, observations at visible wavelengths are impossible. The recent introduction of charge-coupled devices (CCDs) to astrono...

    J. W. V. Storey, J. O. Straede, P. R. Jorden, D. J. Thorne, J. V. Wall in Nature (1982)

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