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    • Fulltext

       

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      Permanent link:
      https://www.ias.ac.in/article/fulltext/joaa/038/01/0010

    • Keywords

       

      Cosmology: large scale structure of Universe; intergalactic medium; diffuse radiation.

    • Abstract

       

      We describe here an ongoing upgrade to the legacy Ooty Radio Telescope (ORT). The ORT is a cylindrical parabolic cylinder 530 m × 30 m in size operating at a frequency of 326.5 (or $z \sim 3.35$ for the HI 21-cm line). The telescope has been constructed on a North–South hill slope whose gradient is equal to the latitude of the hill, making it effectively equatorially mounted. The feed consists of an array of 1056 dipoles. The key feature of this upgrade is the digitization and cross-correlation of the signals of every set of 4-dipoles. This converts the ORT into a 264 element interferometer with a field-of-view of $ 2^{\circ} \times 27.4^{\circ} \cos(\delta)$. This upgraded instrument is called the Ooty Wide Field Array (OWFA). This paper briefly describes the salient features of the upgrade, as well as its main science drivers. There are three main science drivers viz. (1) observations of the large scale distribution of HI in the post-reionization era, (2) studies of the propagation of plasma irregularities through the inner heliosphere and (3) blind surveys for transient sources. More details on the upgrade, as well as on the expected science uses can be found in other papers in this special issue.

    • Author Affiliations

       

      C. R. Subrahmanya1 P. K. Manoharan2 Jayaram N. Chengalur3

      1. Raman Research Institute, C. V. Raman Avenue, Sadashivnagar, Bengaluru 560 080, India.
      2. NCRA-TIFR, Radio Astronomy Centre, P.O. Box 8, Ooty 643 001, India.
      3. NCRA-TIFR, Pune University Campus, Ganeshkhind, Pune 411 007, India.

    • Dates

       
      Published
      15 March 2017
      Manuscript received
      19 July 2016
      Accepted
      18 August 2016

  • 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

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