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  1. No Access

    Article

    Baryon acoustic oscillations from Integrated Neutral Gas Observations: Broadband corrugated horn construction and testing

    The Baryon acoustic oscillations from Integrated Neutral Gas Observations (BINGO) telescope is a 40-m class radio telescope under construction that has been designed to measure the large-angular-scale intensit...

    C. A. Wuensche, L. Reitano, M. W. Peel, I. W. A. Browne… in Experimental Astronomy (2020)

  2. No Access

    Chapter and Conference Paper

    AGN Unification; Past Present and Future

    Historically radio observations have been pivotal in the development of unified models. My feeling is that there are exiting possibilities for wider unification, particularly in the area of the relationship be...

    I. W. A. Browne in The Role of VLBI in Astrophysics, Astrometry and Geodesy (2005)

  3. No Access

    Chapter and Conference Paper

    Gravitational Lensing with a Radio Bias

    I. W. A. Browne in The Role of VLBI in Astrophysics, Astrometry and Geodesy (2005)

  4. No Access

    Chapter and Conference Paper

    The Observational Properties of Blazars; Selection, Relationships and Unification

    I. W. A. Browne in The Role of VLBI in Astrophysics, Astrometry and Geodesy (2005)

  5. No Access

    Chapter and Conference Paper

    The JVAS/Class Gravitational Lens Surveys

    The JVAS/CLASS surveys are designed to find gravitational lens systems in which the flat spectrum cores of radio sources are multiply imaged. The prime motivation for the searches is to find systems from which...

    I. W.A. Browne, N. J. Jackson, P. Augusto, D. R. Henstock… in Observational Cosmology (1998)

  6. No Access

    Chapter and Conference Paper

    The Angular Size-Redshift Test for Compact Radio Sources in the Caltech-Jodrell Bank Surveys

    In 1958 Hoyle first suggested that the angular separation of the components of large double radio sources might be used as a standard rod in the classical angular diameter vs. redshift (θ-z) test (Hoyle 1959). Th...

    P. N. Wilkinson, I. W.A. Browne, D. Alcock, S. Myles… in Observational Cosmology (1998)

  7. No Access

    Chapter and Conference Paper

    Observations and Predictions of the Ratio of 3-Image to 5-Image Systems in JVAS

    In JVAS we find more 5-image systems than 3-image systems. On conventional assumptions, we predict the ratio to be ∽5:1.

    L. J. King, I. W. A. Browne, P. N. Wilkinson… in Astrophysical Applications of Gravitationa… (1996)

  8. No Access

    Chapter

    A Search for Gravitational Milli-Lenses

    We have searched for gravitational milli-lens systems by examining VLBI maps of ∼ 300 flat-spectrum radio sources. So far we have followed up 7 candidates, with separations in the range 2–20 mas. None have bee...

    P. N. Wilkinson, D. R. Henstock… in Examining the Big Bang and Diffuse Backgro… (1996)

  9. No Access

    Chapter and Conference Paper

    Radio Measurement of the Time Delay in 0218+357

    A time delay of 12±3 days has been measured for the lens system 0218+357 using VLA 15GHz polarization observations.

    E. A. Corbett, I. W. A. Browne… in Astrophysical Applications of Gravitationa… (1996)

  10. No Access

    Chapter and Conference Paper

    A VLA/MERLIN/VLBA for Intermediate Scale Lenses and the Discovery of a New Lens System?

    We are searching for small lens systems (50-250 mas or 108 – 109 M ⊙) in a sample of ∼ 1800 flat spectrum radio sources. This is the first time a systematic search ...

    P. Augusto, P. N. Wilkinson, I. W. A. Browne in Astrophysical Applications of Gravitationa… (1996)

  11. No Access

    Chapter and Conference Paper

    0218+357: The smallest separation lensed system

    A MERLIN map with 50 mas resolution at 5 GHz together with VLA maps at other frequencies show that 0218+357 is a gravitationally lensed system with two unresolved images of a compact core separated by 335 mas,...

    A. R. Patnaik, I. W. A. Browne, L. J. King, T. W. B. Muxlow… in Gravitational Lenses (1992)

  12. No Access

    Article

    Spectral differences between radio galaxies and quasars

    IT has been suggested recently1–4 that two classes of radio-loud extragalactic object, narrow-line radio galaxies and quasars, are intrinsically similar, differing only in the angle from which they are seen by th...

    N. Jackson, I. W. A. Browne in Nature (1990)

  13. No Access

    Article

    Anisotropic optical and X-ray emission in quasars

    IT is of fundamental importance in the study of quasars to understand whether or not their continuum emission is isotropic, because this affects the overall energy budget and can also help to distinguish betwe...

    N. Jackson, I. W. A. Browne, D. W. Murphy, D. J. Saikia in Nature (1989)

  14. No Access

    Chapter and Conference Paper

    BL Lac objects, OW/HPQs and unified models

    There is now considerable evidence that bulk relativistic motion is common in the nuclei of radio-loud active galactic nuclei. Progress in relativistic beaming unified models during the last ten years is revie...

    I. W. A. Browne in BL Lac Objects (1989)

  15. No Access

    Chapter and Conference Paper

    Arc Second Structure of Compact Radio Sources

    Radio sources which have the majority of their emission arising from regions ≲ 2 arc sec in diameter are relatively common, forming approximately 30% of all strong sources in surveys made at ∿ 1 GHz. Compact s...

    I. W. A. Browne, M. Charlesworth, T. W. B. Muxlow, A. Tzanetakis… in Astrophysical Jets (1983)

  16. No Access

    Article

    MERLIN observations of superluminal radio sources

    Powerful extragalactic radio sources may all be members of a single family in which those showing superluminal behaviour are the ones in which a relativistic jet is directed towards the observer. The superlumi...

    I. W. A. Browne, R. R. Clark, P. K. Moore, T. W. B. Muxlow, P. N. Wilknson… in Nature (1982)

  17. No Access

    Chapter

    Relativistic Beaming and Quasar Statistics

    The predictions of a scheme which attributes the observed differences between flat and steep spectrum quasars to projection and the effects of relativistic beaming are explored. We conclude that the statistica...

    I. W. A. Browne, M. J. L. Orr in Extragalactic Radio Sources (1982)

  18. No Access

    Article

    VLBI structures of the images of the double QSO 0957 + 561

    Very long baseline interferometry (VLBI) observations of the double QSO 0957 + 561 have revealed radio fine structure in the two ‘image’ components A and B. The structures are similar, both of the ‘core–jet’ t...

    R. W. Porcas, R. S. Booth, I. W. A. Browne, D. Walsh, P. N. Wilkinson in Nature (1981)

  19. No Access

    Article

    VLBI Observations of the double QSO, 0957 + 561 A, B

    Walsh et al.1 originally suggested that the double QSO 0957 + 561 A, B might be images of the same object formed by a gravitational lens because of their remarkably similar optical spectra. Additional optical spe...

    R. W. Porcas, R. S. Booth, I. W. A. Browne, D. Walsh, P. N. Wilkinson in Nature (1979)

  20. No Access

    Article

    Radio studies of the double QSO, 0957 + 561A, B

    The radio source 0957 + 561 has at least four components. Two coincide with the optical QSOs, which is in accordance with the hypothesis that the QSOs are images of a single object due to a gravitational lens....

    G. G. Pooley, I. W. A. Browne, E. J. Daintree, P. K. Moore, R. G. Noble, D. Walsh in Nature (1979)

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