Characterisation of the Mopra Radio Telescope at 16-50GHz

J. S. Urquhart, M. G. Hoare, C. R. Purcell, K. J. Brooks, M. A. Voronkov, B. T. Indermuehle, M. G. Burton, N. F. H. Tothill, P. G. Edwards

    Research output: Contribution to journalArticlepeer-review

    32 Citations (Scopus)

    Abstract

    We present the results of a programme of scanning and mapping observations of astronomical masers and Jupiter designed to characterise the performance of the Mopra Radio Telescope at frequencies between 16 and 50GHz using the 12-mm and 7-mm receivers. We use these observations to determine the telescope beam size, beam shape, and overall telescope beam efficiency as a function of frequency. We find that the beam size is well fit by λ/D over the frequency range with a correlation coefficient of ∼90%. We determine the telescope main beam efficiencies are between ∼48 and 64% for the 12-mm receiver and reasonably flat at 50% for the 7-mm receiver. Beam maps of strong H2O (22GHz) and SiO masers (43GHz) provide a means to examine the radial beam pattern of the telescope. At both frequencies, the radial beam pattern reveals the presence of three components: a central 'core', which is well fit by a Gaussian and constitutes the telescopes main beam; and inner and outer error beams. At both frequencies, the inner and outer error beams extend out to ∼2 and ∼3.4 times the full-width half maximum of the main beam, respectively. Sources with angular sizes of a factor of two or more larger than the telescope main beam will couple to the main and error beams, and therefore the power contributed by the error beams needs to be considered. From measurements of the radial beam power pattern we estimate the amount of power contained in the inner and outer error beams is of order one-fifth at 22GHz, rising slightly to one-third at 43GHz.
    Original languageEnglish
    Pages (from-to)321-330
    Number of pages10
    JournalPublications of the Astronomical Society of Australia
    Volume27
    Issue number3
    DOIs
    Publication statusPublished - 2010

    Fingerprint

    Dive into the research topics of 'Characterisation of the Mopra Radio Telescope at 16-50GHz'. Together they form a unique fingerprint.

    Cite this