1. Home
    2. Journals
    3. Journal of Astrophysics and Astronomy
    4. Volume 19
    5. Issue 1-2

    • Fulltext

       

        Click here to view fulltext PDF


      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/019/01-02/0035-0053

    • Keywords

       

      Radio telescope; low frequency; imaging; southern sky; Fourier Synthesis

    • Abstract

       

      A new, meter-wave radio telescope has been built in the north-east of Mauritius, an island in the Indian Ocean, at a latitude of -20.14‡. The Mauritius Radio Telescope (MRT) is a Fourier Synthesis T-shaped array, consisting of a 2048 m long East-West arm and an 880 m long South arm. In the East-West arm 1024 fixed helices are arranged in 32 groups and in the South arm 16 trolleys, with four helices on each, which move on a rail are used. A 512-channel digital complex correlation receiver is used to measure the visibility function. At least 60 days of observing are required for obtaining the visibilities up to 880 m spacing. The Fourier transform of the calibrated visibilities produces a map of the area of the sky under observation with a synthesized beam width 4′ × 4.6′ sec(δ + 20.14‡) at 151.5 MHz.

      The primary objective of the telescope is to produce a sky survey in the declination range –70‡ to –10‡ with a point source sensitivity of about 200 mJy (3a level). This will be the southern sky equivalent of the Cambridge 6C survey. In this paper we describe the telescope, discuss the array design and the calibration techniques used, and present a map made using the telescope.

    • Author Affiliations

       

      K. Golap1 N. Udaya Shankar1 2 S. Sachdev1 2 R. Dodson2 3 Ch. V. Sastry1 4

      1. Departments of Physics, University of Mauritius, Reduit, Mauritius
      2. Raman Research Institute, Sadashivanagar, Bangalore - 560 080, India
      3. Physics Department, University of Durham, Durham, UK
      4. Indian Institute of Astrophysics, Koraimangala, Bangalore - 560 034, India

    • Dates

       
      Published
      June 1998
      Manuscript received
      18 May 1998
      Accepted
      3 August 1998

  • Journal of Astrophysics and Astronomy | News

    • Continuous Article Publication

      Posted on January 27, 2016

      Since January 2016, the Journal of Astrophysics and Astronomy has moved to Continuous Article Publishing (CAP) mode. This means that each accepted article is being published immediately online with DOI and article citation ID with starting page number 1. Articles are also visible in Web of Science immediately. All these have helped shorten the publication time and have improved the visibility of the articles.

    • Editorial Note on Continuous Article Publication

      Posted on July 25, 2019

      Click here for Editorial Note on CAP Mode

© 2022-2023 Indian Academy of Sciences, Bengaluru.

Contact | Site index